EM78452
8-Bit Microcontroller
1 General Description
The EM78452 is an 8-bit microprocessor designed and developed with low-power, high-speed CMOS
technology. It has 4K×13-bit on-chip ROM and 140×8-bit on-chip general purpose registers. Its operational
kernel is implemented with RISC-like architecture and it is available in mask ROM version. The one time
programmable (OTP) version is flexible, in both mass production and engineering test stages. OTP
provides users with unlimited volume along with favorable price opportunities. This device is equipped with
Serial Peripheral Interface (SPI) function, and it is suitable for wired communication. There are 58
easy-to-learn instructions and the user’s program can be emulated with the EMC In-Circuit Emulator (ICE).
2 Features
CPU configuration
Serial Peripheral Interface (SPI)
Four available interrupts:
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4K×13 bits on-chip ROM
140×8 bits on chip general purpose registers
11 special function registers
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External interrupt (/INT)
SPI transmission completed interrupt
TCC overflow interrupt
5-level stacks for subroutine nesting
Low power consumption:
Timer 1 overflow interrupt
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Less than 3 mA at 5V/4MHz
Peripheral configuration
Typically 10 μA during sleep mode
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8-bit real time clock/counter (TCC) with overflow
interrupt
I/O port configuration
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Power down mode
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5 bidirectional I/O ports (35 I/O pins)
12 Wake-up pins
I/O ports have Programmable wake-up function
from sleep mode
32 programmable pull-high input pins
2 open-drain I/O pins
2 ~ 4 machine clocks for each instruction cycle
2 R-option pins
3 LED Direct sinking pins with internal serial resistors
Operating voltage range: 1.8V ~ 5.5V
Built-in power-on reset
Operating temperature range: 0°C ~70°C
Operating frequency range (base on two clocks):
Programmable free running on-chip watchdog timer
Package Type:
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Crystal mode:
DC ~ 20MHz @ 5V
DC ~ 16MHz @ 2.2V
DC ~ 4MHz @ 1.8V
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40-pin DIP 600mil
40-pin SOP 450mil
44-pin QFP
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EM78452P
EM78452WM
EM78452AQ
Product Specification (V1.0) 10.18.2007
(This specification is subject to change without further notice)
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ELAN [ ELAN MICROELECTRONICS CORP ]
