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ST72E121 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. ST72E121
Description  8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72E121 Datasheet(HTML) 4 Page - 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)
(5 bits)
4


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