W79E201A16 - 8-BIT MICROCONTROLLER

1. GENERAL DESCRIPTION 

The W79E201 is a fast 8051 compatible microcontroller with a redesigned processor core without 

wasted clock and memory cycles. The W79E201 contains In-System Programmable (ISP) 16 KB AP 

Flash EPROM; 4KB LD Flash EPROM for loader program; a 256 bytes of RAM; one 8-bit digital or 

analog input port (Port 1); three 8-bit bi-directional and bit-addressable I/O ports; an 1-bit port P4.0 for 

external ISP reboot used; three 16-bit timer/counters; one serial ports. These peripherals are 

supported by 8 sources two-level interrupt capability. To facilitate programming and verification, the 

FLASH EPROM inside the W79E201 allows the program memory to be programmed and read 

electronically. Once the code is confirmed, the user can protect the code for security. The W79E201 is 

added 10-bit ADC with an 8 channel analog input with digital input port. Furthermore, the 

W79E201A16LN, packaged in 48-pin LQFP, supports the in circuit emulation (ICE) function with 

JTAG interface to the development tool. The W79E201 executes every 8051 instruction faster than 

the original 8051 for the same crystal speed. Typically, the instruction executing time of W79E201 is 

1.5 to 3 times faster than that of traditional 8051, depending on the type of instruction. In general, the 

overall performance is about 2.5 times better than the original for the same crystal speed. Giving the 

same throughput with lower clock speed, power consumption has been improved. Consequently, the 

W79E201 is a fully static CMOS design; it can also be operated at a lower crystal clock. 

2. FEATURES 

• Fully static design 8-bit Turbo 51 CMOS microcontroller up to 16MHz 

• 16K bytes of in-system-programmable Flash EPROM (AP Flash EPROM) 

• 4KB Auxiliary Flash EPROM for loader program (LD Flash EPROM) 

• 256 bytes of on-chip RAM 

• Instruction-set compatible with MSC-51 

• On-chip debug function with JTGA interface to development tool 

• Three 8-bit bi-directional ports 

• Three 16-bit timer/counters 

• 8 interrupt source with two levels of priority 

• One enhanced full duplex serial port with framing error detection and automatic address 

recognition 

• Port 0 internal pull-up resistor optional 

• Programmable Watchdog Timer 

• 6 channel PWM 

• Software programmable access cycle to external RAM/peripherals 

• 10-bits ADC with 8 channel analog input or digital input port (At least 8-bits resolution guaranteed) 

• Packages: 

 − PLCC 44: W79E201A16PN 

 − QFP 44: W79E201A16FN 

 − LQFP 48: W79E201A16LN

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