ST72E121 datasheet(4/92 Pages) STMICROELECTRONICS

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ST72E121 ST72T121

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST72T121 HCMOS Microcontroller Unit

(MCU) is a member of the ST7 family. The device

is based on an industry-standard 8-bit core and

features an enhanced instruction set. The device

is normally operated at a 16 MHz oscillator fre-

quency. Under software control, the ST72T121

may be placed in either Wait, Slow or Halt modes,

thus reducing power consumption. The enhanced

instruction set and addressing modes afford real

programming potential. In addition to standard

8-bit data management, the ST72T121 features

true bit manipulation, 8x8 unsigned multiplication

and indirect addressing modes on the whole mem-

ory. The device includes a low consumption and

fast start on-chip oscillator, CPU, program memo-

ry (OTP/EPROM versions), RAM, 32 I/O lines, a

Low Voltage Detector (LVD) and the following on-

chip peripherals: industry standard synchronous

SPI and asynchronous SCI serial interfaces, digit-

al Watchdog, two independent 16-bit Timers, one

featuring an External Clock Input, and both featur-

ing Pulse Generator capabilities, 2 Input Captures

and 2 Output Compares (only 1 Input Capture and

1 Output Compare on Timer A).

Figure 1. ST72T121 Block Diagram

8-BIT CORE

ALU

OSCIN

OSCOUT

RESET

PORT B

TIMER B

PORT C

SPI

PORT E

SCI

PORT D

WATCH DOG

PB0 -> PB4

PC0 -> PC7

PE0 -> PE1

PD0 -> PD5

OSC

Internal

CLOCK

CONTROL

RAM

(384 - 512 Bytes)

PORT F

PF0 -> PF2,4,6,7

TIMER A

PORT A

PA3 -> PA7

(6 bits)

AND LVD

(6 bits)

(8 bits)

VSS

VDD

POWER

SUPPLY

PROGRAM

(8 - 16K Bytes)

MEMORY

(2 bits)

(5 bits)

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