
TMS370Cx9x
8-BIT MICROCONTROLLER
SPNS036B –  JANUARY 1996 – REVISED FEBRUARY 1997
3
POST OFFICE BOX 1443 
 HOUSTON, TEXAS 77251–1443
functional block diagram
Program Memory
ROM: 4K Bytes
EPROM: 8K Bytes
VSS
VCC
RESET
MC
XTAL2/
CLKIN
XTAL1
INT1
E0–E7
or
AN0–AN7
Data EEPROM
256 Bytes
RAM
128 Bytes
CPU
Watchdog
Timer 1
A-to-D Converter 3
System Control
Clock Options:
Divide-by-4 or
Divide-by-1(PLL)
T1PWM
T1EVT
T1IC/CR
VSS3
VCC3
Port A
Interrupts
8
Port D
5
AN8–AN14
description
The TMS370C090A, TMS370C792, and SE370C792 devices are members of the TMS370 family of single-chip
8-bit microcontrollers. Unless otherwise noted, the term TMS370Cx9x refers to these devices. The TMS370
family provides cost-effective real-time system control through integration of advanced peripheral function
modules and various on-chip memory configurations.
The TMS370Cx9x family is implemented using high-performance silicon-gate CMOS EPROM and EEPROM
technologies. The low-operating power, wide-operating temperature range, and noise immunity of CMOS
technology coupled with the high performance and extensive on-chip peripheral functions make the
TMS370Cx9x devices attractive in system designs for automotive electronics, industrial motor control,
computer peripheral control, telecommunications, and consumer application.
All TMS370Cx9x devices contain the following on-chip peripheral modules:
Fifteen-channel, 8-bit analog-to-digital converter 3 (ADC3)
One 24-bit general-purpose watchdog timer
One 16-bit general-purpose timer with an 8-bit prescaler