Core

• Fully static design 8-bit Turbo 51 (4T) CMOS microcontroller
• Instruction sets fully compatible with the MCS-51

Operating voltage range

• V_DD= 4.5V to 5.5V at FOSC up to 24MHz
• V_DD = 3.0V to 5.5V at Internal RC 22.1184MHz
• V_DD = 2.4V to 5.5V at FOSC = 4~12MHz or Internal RC 11.0592MHz

Operating temperature range

• - 40 ° C ~ 85 °C

Clock Source

• High-speed external oscillator
  — Up to 24 MHz Crystal and resonator (enabled by CONFIG-bits)
• Internal RC oscillator: 22.1184MHz/11.0592MHz (selectable by CONFIG-bits)
  — ± 1% at V_DD = 5V and 25 °C
  — ± 3% at V_DD = 2.7V ~ 5.5V and 25 °C
  — ± 5% at V_DD = 2.7V ~ 5.5V and -10 °C~+ 70 °C
  — ± 8% at V_DD = 2.7V ~ 5.5V and -40 °C ~ 85 °C
• Flexible CPU clock source configurable by CONFIG-bits and software
• 8-bit Programmable CPU clock divider(DIVM)

On-chip Memory

• 100,000 erase/write cycles
• N79E845A: 16 Kbytes shared by APROM and Data Flash depending on CONFIG-bits definitions
• N79E844A: 8 Kbytes APROM, 4 Kbytes Data Flash
• N79E8432A: 4 Kbytes APROM, 4 Kbytes Data Flash
• APROM, LDROM and Data Flash security protection
• Flash page size as 128 bytes
• 256 bytes of on-chip direct/indirect RAM
• 256 bytes of XRAM, accessed by MOVX instruction
• On-chip Flash programmed through
  — Parallel H/W Writer mode
  — Serial In-Circuit-Program mode (ICP)
  — Software Implemented ISP (In-System-Program)

I/O Ports

• Maximum 17 I/O pins
• All I/O pin besides P1.2 and P1.3 support 4 software configurable output modes
• Software selectable TTL or Schmitt trigger input type per port
• 14 interrupt sources with four levels of priority
• LED drive capability 38mA on P10, P11, P14, P16, P17
• LED drive capability 20mA on port 0 and port 3

Timer/Counter

• 2 sets 16-bit Timers/Counters
• One 16-bit Timer with two channel of input captures

Watchdog Timer

• Programmable Watchdog Timer
• Clock source supported by internal 10kHz ±50% accuracy RC oscillator

Serial ports (UART, SPI, I²C)

• One set enhanced full duplex UART port with framing error detection and automatic address recognition.
• One set SPI with master/slave capability
• One set I²C with master/slave capability

PWM

• 4 channels 10-bit PWM outputs with one brake/fault input

KBI

• 8-keypad interrupt inputs(KBI) with 8 falling/rising/both-edge detection pins selected by software

ADC

• 10-bit A/D converter
• Up to 150 Ksps.(sample per second)
• 7 analog input channels

Brown-out Detector

• 2 -level ( 3.8V / 2.7V ) BOD detector
• Supports interrupt and reset options

POR (Power on Reset)

• Threshold voltage levels is 2.0V

Built-in power management

• Idle mode
• Power down mode with optional enabled WDT functions

Development Tools

• Hardware writer
• ICP programmer
• ISP update APROM by UART port