EM78P157N数据手册Elan中文资料规格书

描述 Description

The EM78P157N is an 8-bit microprocessor designed and developed with low-power, high-speed CMOS technology. It is quipped with 1k x 13-bits Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides three PROTECTION bits to prevent user's code in the OTP memory from being intruded. Eight OPTION bits are also available to meet user's requirements. With its OTP-ROM feature, the EM78P157N is able to offer a convenient way of developing and verifying user's programs. Moreover, user can take advantage of the ELAN Writer to easily program his development code.

特性 Features

• Operating voltage range: 2.5V~5.5V
• Operating temperature range: -40°C~85°C
• Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.5V
• ERC mode: DC~4MHz at 2.5V
• Less then 2 mA at 5V/4MHz
• Typically 20 µA at 3V/32KHz
• Typically 1 µA during sleep mode
• 1K x 13 bits on chip ROM
• One security register to prevent intrusion of OTP memory codes
• One configuration register to accommodate user's requirements
• 48 bytes on chip registers (SRAM, general purpose register)
• 2 bi-directional I/O ports
• 5 level stacks for subroutine nesting
• 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
• Two clocks per instruction cycle
• Power down (SLEEP) mode
• Three available interruptions: TCC overflow interrupt, Input-port status changed interrupt (wake up from sleep mode), External interrupt
• Programmable free running watchdog timer
• 8 programmable pull-high pins
• 7 programmable pull-down pins
• 8 programmable open-drain pins
• 2 programmable R-option pins
• 99.9% single instruction cycle commands
• The transient point of system frequency between HXT and LXT is around 400KHz