EM78P458/459
OTP ROM
Specification Revision History
Version
Content
1.0 Initial
version
1.1
Modify ERC frequency
03/06/2003
1.2
Add AD & OP spec
05/07/2003
1.3
Change Power on reset content
07/01/2003
1.4
Add the Device Characteristic at section 6.5
06/25/2004
Application Note
AN-001 A/D Pre-amplifier
AN-002 Calibration Offset on A/D
AN-003 Example of Microcomputer Digital Thermometer
AN-004 Tips on how to apply EM78P458
AN-005 Tips on how to apply A/D Converter
AN-006 AD & R4
AN-007 Enhancing Noise Immunity
This specification is subject to change without prior notice. 06.25.2004 (V1.4)
2
EM78P458/459
OTP ROM
1. GENERAL DESCRIPTION
EM78P458 and EM78P459 are 8-bit microprocessors designed and developed with low-power and
high-speed CMOS technology. It is equipped with a 4K*13-bit Electrical One Time Programmable Read
Only Memory (OTP-ROM).
With its OTP-ROM feature, it is able to offer a convenient way of developing and verifying user's programs.
Moreover, user can take advantage of EMC Writer to easily program his development code.
This specification is subject to change without prior notice. 06.25.2004 (V1.4)
3
EM78P458/459
OTP ROM
2. FEATURES
Operating voltage range: 2.3V~5.5V
Operating temperature range: 0
C~70C
Operating frequency range(base on 2 clocks):
* Crystal mode: DC ~ 20MHz/2clks,5V; DC ~ 8MHz/2clks,3V
* RC mode: DC ~ 4MHz/2clks,5V; DC ~ 4MHz/2clks,3V
Low power consumption:
* Less than 1.5 mA at 5V/4MHz
* Typically 15
A, at 3V/32KHz
* Typically 1
A, during sleep mode
4K
13 bits on chip ROM
84
8 bits on chip registers (SRAM)
2 bi-directional I/O ports
8 level stacks for subroutine nesting
8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
8-bit multichannel Analog-to-Digital Converter with 8-bit resolution
Dual Pulse Width Modulation (PWM ) with 10-bit resolution
One pair of comparators
Power-down (SLEEP) mode
Six available interruptions
* TCC overflow interrupt
* Input-port status changed interrupt (wake up from the sleep mode)
* External interrupt
* ADC completion interrupt
* PWM period match completion
* Comparator high interrupt
Programmable free running watchdog timer
8 Programmable pull-down I/O pins
7 programmable pull-high I/O pins
8 programmable open-drain I/O pins
Two clocks per instruction cycle
Package types:
This specification is subject to change without prior notice. 06.25.2004 (V1.4)
4
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