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.
2 FEATURES
􀂄 Operating voltage range: 2.3V~5.5V
􀂄 Operating temperature range: 0°C~70°C
􀂄 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 μA, at 3V/32KHz
• Typically 1 μA, 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
EM78P458/459
8-Bit Microcontroller with OTP ROM
2 • Product Specification (V1.5) 04.01.2004
(This specification is subject to change without further notice)
• 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:
• 18 pin DIP 300mil : EM78P458BP
• 18 pin SOP 300mil : EM78P458BM
• 20 pin DIP 300mil : EM78P458AP
• 20 pin SOP 300mil : EM78P458AM
• 24 pin skinny DIP 300mil : EM78P459AK作者: sharker 时间: 2008-6-5 20:38
EM78P458AM的引脚说明：
