Rev. 4190A805111/02
Features
80C51 Compatible
Three I/O Ports
Two 16-bit Timer/Counters
256 Bytes RAM
4K Bytes ROM/OTP Program Memory with 64 Bytes Encryption Array and 3 Security
Levels
High-Speed Architecture
33 MHz at 5V (66 MHz Equivalent)
20 MHz at 3V (40 MHz Equivalent)
X2 Speed Improvement Capability (6 Clocks/Machine Cycle)
10-bit, 8 Channels A/D Converter
Hardware Watchdog Timer
Programmable I/O Mode: Standard C51, Input Only, Push-pull, Open Drain
Asynchronous Port Reset
Full Duplex Enhanced UART with Baud Rate Generator
SPI, Master Mode
Dual System Clock
Crystal or Ceramic Oscillator (33/40 MHz)
Internal RC Oscillator (12 MHz)
Programmable Prescaler
Programmable Counter Array with High-speed Output, Compare/Capture, Pulse Width
Modulation and Watchdog Timer Capabilities
Interrupt Structure
8 Interrupt Sources
4 Interrupt Priority Levels
Power Control Modes
Idle Mode
Power-down Mode
Power-off Flag
Power Supply: 2.7 - 5.5V
Temperature Range: Industrial (-40 to 85
o
C)
Package: SO24, DIL24, SSOP24
Description
The AT8xC5111 is a high-performance ROM/OTP version of the 80C51 8-bit micro-
controller in low pin count package.
The AT8xC5111 retains all the features of the standard 80C51 with 4K Bytes
ROM/OTP program memory, 256 bytes of internal RAM, an 8-source, 4-level interrupt
system, an on-chip oscillator and two timer/counters.
The AT8xC5111 is dedicated for analog interfacing applications. For this, it has a 10-
bit, 8 channels A/D converter and a five-channel Programmable Counter Array.
In addition, the AT8xC5111 has a Hardware Watchdog Timer, a versatile serial chan-
nel that facilitates multiprocessor communication (EUART) with an independent baud
rate generator, an SPI serial bus controller and a X2 speed improvement mechanism.
The X2 feature permits keeping the same CPU power at an oscillator frequency
divided by two. The prescaler allows to decrease CPU and peripherals clock
frequency.
The fully static design of the AT8xC5111 can reduce system power consumption by
bringing the clock frequency down to any value, even DC, without loss of data.
The AT8xC5111 has 3 software-selectable modes of reduced activity for further reduc-
tion in power consumption. In the idle mode, the CPU is frozen while the peripherals
are still operating. In the quiet mode, only the A/D converter is operating.
Low Pin Count
8-bit
Microcontroller
with A/D
Converter
AT83C5111
AT87C5111
2
AT8xC5111
4190A805111/02
In the power-down mode, the RAM is saved and all other functions are inoperative. Two
oscillator sources, crystal and RC, provide a versatile power management.
The AT8xC5111 is proposed in low-pin count packages. Port 0 and Port 2 (address/data
buses) are not available .
Block Diagram
Notes:
1. Alternate function of Port 1.
2. Alternate function of Port 3.
3. Alternate function of Port 4.
Timer 0
INT
RAM
256
T0
T1
Rx
D
Tx
D
XTAL2
XTAL1
EUART
CPU
Timer 1
IN
T
1
Ctrl
IN
T
0
C51
CORE
(2) (3)
(2) (3)
Port 1 Port 3
P1
P4
IB-bus
Watch
Dog
Vs
s
Vc
c
(2)
(2)
ROM /OTP
4K *8
x8
ECI
CEX0
-
4
Xtal
Osc
RC
Osc
(1)
(1)
Port 4
P3
(2)
(2)
(2)
PCA
MIS
O
(3)
MO
S
I
(3)
SPS
CK
(3)
SPI
BRG
SS
(3)
RST
/
V
PP
A/D
Converter
V
RE
F
AIN
0
-
7
(3)
Parallel I/O Ports
3
AT8xC5111
4190A805111/02
SFR Mapping
The Special Function Registers (SFRs) of the AT8xC5111 belong to the following
categories:
C51 core registers: ACC, B, DPH, DPL, PSW, SP, AUXR1
I/O port registers: P1, P3, P4, P1M1, P1M2, P3M1, P3M2, P4M1, P4M2
Timer registers: TCON, TH0, TH1, TMOD, TL0, TL1
Serial I/O port registers: SADDR, SADEN, SBUF, SCON, BRL, BDRCON
Power and clock control registers: CKCON0, CKCON1, OSCCON, CKSEL, PCON,
CKRL
Interrupt system registers: IE, IE1, IPL0, IPL1, IPH0, IPH1
Watchdog Timer: WDTRST, WDTPRG
SPI: SPCON, SPSTA, SPDAT
PCA: CCAP0L, CCAP1L, CCAP2L, CCAP3L, CCAP4L, CCAP0H, CCAP1H,
CCAP2H, CCAP3H, CCAP4H, CCAPM0, CCAPM1, CCAPM2, CCAPM3,
CCAPM4, CL, CH, CMOD, CCON
ADC: ADCCON, ADCCLK, ADCDATH, ADCDATL, ADCF
4
AT8xC5111
4190A805111/02
Reserved
Table 1. SFR Addresses and Reset Values
0/8
1/9
72/A
3/B
4/C
5/D
6/E
7/F
F8h
CH
0000 0000
CCAP0H
XXXX XXXX
CCAP1H
XXXX XXXX
CCAP2H
XXXX XXXX
CCAP3H
XXXX XXXX
CCAP4H
XXXX XXXX
FFh
F0h
B
0000 0000
ADCLK
0000 0000
ADCON
0000 0000
ADDL
XXXXXX00
ADDH
0000 0000
ADCF
0000 0000
F7h
E8h
CL
0000 0000
CCAP0L
XXXX XXXX
CCAP1L
XXXX XXXX
CCAP2L
XXXX XXXX
CCAP3L
XXXX XXXX
CCAP4L
XXXX XXXX
CONF
EFh
E0h
ACC
0000 0000
P1M2
0000 0000
P3M2
0000 0000
P4M2
0000 0000
E7h
D8h
CCON
00X0 0000
CMOD
X000 0000
CCAPM0
00XX X000
CCAPM1
X000 0000
CCAPM2
X000 0000
CCAPM3
X000 0000
CCAPM4
X000 0000
DFh
D0h
PSW
0000 0000
P1M1
0000 0000
P3M1
0000 0000
P4M1
0000 0000
D7h
C8h
CFh
C0h
P4
1111 1111
SPCON
0001 0100
SPSTA
XXXXXXXX
SPDAT
XXXX XXXX
C7h
B8h
IPL0
0000 0000
SADEN
0000 0000
BFh
B0h
P3
1111 1111
IE1
0000 0000
IPL1
0000 0000
IPH1
0000 0000
IPH0
X000 0000
B7h
A8h
IE0
0000 0000
SADDR
0000 0000
CKCON1
XXXX XXX0
AFh
A0h
AUXR1
XXXXXXX0
WDRST
0000 0000
WDTPRG
0000 0000
A7h
98h
SCON
0000 0000
SBUF
XXXX XXXX
BRL
0000 0000
BDRCON
0000 0000
9Fh
90h
P1
1111 1111
CKRL
1111 1111
97h
88h
TCON
0000 0000
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
TH0
0000 0000
TH1
0000 0000
CKCON0
X000X000
8Fh
80h
SP
0000 0111
DPL
0000 0000
DPH
0000 0000
CKSEL
XXXX XXX1
OSCCON
XXXX XX01
PCON
00X1 0000
87h
0/8
1/9
2/A
3/B
4/C
5/D
6/E
7/F
5
AT8xC5111
4190A805111/02
Pin Configuration
Pin Descriptions
XTAL1
P1.7/CEX4
P4.7/AIN7
1
VCC
P1.6/CEX3
P3.1/TxD
P1.3/CEX0
P1.2/ECI
P1.4/CEX1
P4.4/MISO/AIN4
P4.6/SPSCK/AIN6
P4.5/MOSI/AIN5
P4.3/INT1/AIN3
P4.2/SS/AIN2
P4.1/AIN1/T1
P4.0/AIN0
P3.0/RxD
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
P1.5/CEX2
P3.3/T0
P3.2/INT0
SO24
DIL24
VREF
VSS
RST/VPP
XTAL2
XTAL2
XTAL1
VREF
1
AVCC
P1.6/CEX3
P3.1/TxD
P1.3/CEX0
P1.2/ECI
P1.4/CEX1
P4.4/MISO/AIN4
P4.6/SPSCK/AIN6
P4.5/MOSI/AIN5
P4.3/INT1/AIN3
P4.2/SS/AIN2
P4.1/AIN1/T1
P4.0/AIN0
P3.0/RxD
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
P1.5/CEX2
P3.3/T0
P3.2/INT0
SSOP24
VSS
AVSS
VCC
RST/VPP
Mnemonic
Type
Name and Function
V
SS
I
Ground: 0V reference
V
CC
I
Power Supply: This is the power supply voltage for normal, idle and power-down operation.
VREF
I
VREF: A/D converter positive reference input
RST/VPP
I
RST/V
PP
: Reset/Programming Supply Voltage:
A low on this pin for two machine cycles while the oscillator is running, resets the device. This pin
has no pull-up. In order to use the internal power-on reset, an external pull-up resistor must be
connected.
This pin also receives the 12V programming pulse which will start the EPROM programming and the
manufacturer test modes.
XTAL1
I
XTAL1 : Input to the inverting oscillator amplifier and input to the internal clock generator circuits
XTAL2
O
XTAL2 : Output from the inverting oscillator amplifier
P1.2 - P1.7
I/O
Port 1: Port 1 is an 6-bit programmable I/O port . See Section "Ports", page 18 for a description of
I/O ports.
Alternate functions for Port 1 include:
I/O
ECI (P1.2): External Clock for the PCA
I/O
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
I/O
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
I/O
CEX2 (P1.5): Capture/Compare External I/O for PCA module 2
I/O
CEX3 (P1.6): Capture/Compare External I/O for PCA module 3
I/O
CEX4 (P1.7): Capture/Compare External I/O for PCA module 4
P3.0 - P3.3
I/O
Port 3: Port 3 is an 6-bit programmable I/O port with internal pull-ups. See Section "Ports", page 18
for a description of I/O ports.
Port 3 also serves the special features of the 80C51 family, as listed below.
I/O
RXD (P3.0): Serial input port
I/O
TXD (P3.1): Serial output port
PDF 
ZIP