ST72121J4 查看數據表（PDF） - STMicroelectronics

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ST72121J4

8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

STMicroelectronics 

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

Figure 1. ST72T121 Block Diagram

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).

OSCIN

OSCOUT

RESET

PF0 -> PF2,4,6,7

(6 bits)

VDD

VSS

OSC

Internal

CLOCK

CONTROL

AND LVD

8-BIT CORE

ALU

PROGRAM

MEMORY

(8 - 16K Bytes)

RAM

(384 - 512 Bytes)

PORT F

TIMER A

POWER

SUPPLY

PORT A

PORT B

TIMER B

PORT C

SPI

PORT D

PORT E

SCI

WATCHDOG

PA3 -> PA7

(5 bits)

PB0 -> PB4

(5 bits)

PC0 -> PC7

(8 bits)

PD0 -> PD5

(6 bits)

PE0 -> PE1

(2 bits)

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