HD404654 Series
4-Bit Single-Chip Microcomputer
Rev. 7.0
Sept. 1999
Description
The HD404654 Series is a member of the HMCS400-series of microcomputers designed to increase
program productivity with large-capacity memory. Each microcomputer has a high-precision dual-tone
multi-frequency (DTMF) generator, three timers, serial interface, voltage comparator, and input capture
circuit.
The HD404654 Series includes three chips: the HD404652 with 2 k-word ROM; the HD404654 with 4 k-
word ROM; and the HD4074654 with 4 k-word PROM (ZTAT
TM
version).
The HD4074654 is a PROM version (ZTAT
TM
microcomputer). A program can be written to the PROM by
a PROM writer, which can dramatically shorten system development periods and smooth the process from
debugging to mass production. (The ZTAT
TM
version is 27256-compatible.)
ZTAT
TM
: Zero Turn Around Time. ZTAT is a trademark of Hitachi Ltd.
Features
27 I/O pins and 5 dedicated input pins
10 high-current output pins: Six 15-mA sinks and four 10-mA sources
Three timer/counters
Eight-bit input capture circuit
Two timer outputs (including two PWM outputs)
One event counter input (including one double-edge function)
One clock-synchronous 8-bit serial interface
Voltage comparator (2 channels)
On-chip DTMF generator (f
OSC
= 400 kHz, 800 kHz, 2 MHz, 3.58 MHz or 4 MHz)
Built-in oscillators
Main clock: Ceramic or crystal oscillator (an external clock is also possible)
Six interrupt sources
Two by external sources
Four by internal sources
Subroutine stack up to 16 levels, including interrupts
HD404654 Series
2
Two low-power dissipation modes
Standby mode
Stop mode
One external input for transition from stop mode to active mode
Instruction cycle time: 1
s (f
OSC
= 4 MHz at 1/4 division ratio)
1/4 or 1/32 division ratio can be selected by hardware
Two operating modes
MCU mode
MCU/PROM mode (HD4074654)
Ordering Information
Type
Product Name
Model Name
ROM (Words)
RAM (digit)
Package
Mask ROM HD404652
HD404652H
2,048
512
FP-44A
HD404652S
DP-42S
HD404654
HD404654H
4,096
FP-44A
HD404654S
DP-42S
ZTAT
TM
HD4074654
HD4074654H
4,096
FP-44A
HD4074654S
DP-42S
HD404654 Series
3
Pin Arrangement
RD /COMP
RD /COMP
TONEC
TONER
VT
ref
RE /VC
ref
TEST
OSC
OSC
RESET
GND
D
D
D
D
D
D
D
D
D
D
0 0
1 1
0
1
2
0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
DP-42S
V
SEL
R4 /SO
R4 /SI
R4 /
SCK
R4 /EVND
R3
R3 /TOD
R3 /TOC
R3
R2
R2
R2
R2
R1
R1
R1
R1
R0 /
INT
D /
INT
D /
STOPC
CC
3 1
2 1
1 1
0
3
2
1
0
3
2
1
0
3
2
1
0
0 1
13 0
12
1
2
3
4
5
6
7
8
9
10
11
33
32
31
30
29
28
27
26
25
24
23
44
43
42
41
40
39
38
37
36
35
34
12
13
14
15
16
17
18
19
20
21
22
FP-44A
RE
0
/VC
ref
TEST
OSC
1
OSC
2
RESET
GND
D
0
D
1
D
2
D
3
D
4
R4 /EVND
R3
R3 /TOD
R3 /TOC
R3
R2
R2
R2
R2
R1
R1
0
3
2
1
0
3
2
1
0
3
2
D
D
D
D
D
D /
STOPC
D /
INT
R0 /
INT
R1
R1
NC
5
6
7
8
9
12
13 0
0 1
0
1
NC
VT
ref
TONER
TONEC
RD /COMP
RD /COMP
V
SEL
R4 /SO
R4 /SI
R4 /
SCK
1 1
0 0
CC
3 1
2 1
1 1
(top view)
HD404654 Series
4
Pin Description
Pin Number
Item
Symbol
DP-42S
FP-44A
I/O
Function
Power supply
V
CC
42
38
Applies power voltage
GND
11
6
Connected to ground
Test
TEST
7
2
I
Used for factory testing only: Connect this pin to
V
CC
Reset
RESET
10
5
I
Resets the MCU
Oscillator
OSC
1
8
3
I
OSC
2
9
4
O
Port
D
0
D
9
1221
716
I/O
Input/output pins addressed by individual bits;
pins D
4
D
9
are high-current sink pins that can
each supply up to 15 mA, D
0
D
3
are large-
current source pins that can each supply up to 10
mA
D
12
, D
13
22, 23
17, 18
I
Input pins addressable by individual bits
R0
0
R4
3
2440
1921,
2336
I/O
Input/output pins addressable in 4-bit units
RD
0
, RD
1
, RE
0
1, 2, 6
39, 40,1
I
Input pins addressable in 4-bit units
Interrupt
INT
0
,
INT
1
23, 24
18, 19
I
Input pins for external interrupts
Stop clear
STOPC
22
17
I
Input pin for transition from stop mode to active
mode
Serial
SCK
1
38
34
I/O
Serial clock input/output pin
SI
1
39
35
I
Serial receive data input pin
SO
1
40
36
O
Serial transmit data output pin
Timer
TOC, TOD
34, 35
30, 31
O
Timer output pins
EVND
37
33
I
Event count input pins
DTMF
TONER
4
42
O
Output pin for DTMF row signals
TONEC
3
41
O
Output pin for DTMF column signals.
VT
ref
5
43
Reference voltage pin for DTMF signals
Voltage condition is V
CC
VT
ref
GND.
Comparator
COMP
0
,
COMP
1
1, 2
39, 40
I
Analog input pins for voltage comparator
VC
ref
6
1
Reference voltage pin for inputting the threshold
voltage of the analog input pin.
Division rate
SEL
41
37
I
Input pin for selecting system clock division rate
rate after
RESET
input or after stop mode
cancellation.
1/4 division rate: Connect it to V
CC
1/32 division rate: Connect it to GND
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