TMS370 datasheet(5/73 Pages) TI

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TMS370Cx6x

8-BIT MICROCONTROLLER

SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

description (continued)

D One 24-bit general-purpose watchdog timer

D Three 16-bit general-purpose timers (one with an 8-bit prescaler)

Table 2 provides a memory configuration overview of the TMS370Cx6x devices.

Table 2. Memory Configurations

DEVICE

PROGRAM

MEMORY

(BYTES)

OFF-CHIP

MEMORY

EXP (BYTES)

DATA MEMORY

(BYTES)

OPERATING

MODES

PACKAGES

68-PIN PLCC/CLCC

ROM

EPROM

EXP. (BYTES)

RAM

EEPROM

µC†

µP†

TMS370C067A

24K

—

24K

256

√

FN – PLCC

TMS370C068A

32K

—

24K

256

√

FN – PLCC

TMS370C069A

48K‡

—

3.5K

256

√

FN – PLCC

TMS370C768A

—

32K

24K

256

√

FN – PLCC

TMS370C769A

—

48K‡

3.5K

256

√

FN – PLCC

SE370C768A§

—

32K

24K

256

√

FZ – CLCC

SE370C769A§

—

48K‡

3.5K

256

√

FZ – CLCC

†

µC – Microcomputer mode

µP – Microprocessor mode

‡ ’x69 can only operate up to 3 MHz SYSCLK.

§ System evaluators and development tools are for use only in a prototype environment, and their reliability has not been characterized.

The suffix letter (A) appended to the device names shown in the device column of Table 2 indicates the

configuration of the device. ROM or EPROM devices have different configurations as indicated in Table 3. ROM

devices with the suffix letter A are configured through a programmable contact during manufacture.

Table 3. Suffix Letter Configuration

DEVICE¶

WATCHDOG TIMER

CLOCK

LOW-POWER MODE

EPROM A

Standard

Divide-by-4 (Standard oscillator)

Enabled

Standard

ROM A

Hard

Divide-by-4 or Divide-by-1 (PLL)

Enabled or disabled

Simple

¶ Refer to the “device numbering conventions” section for device nomenclature and the “device part numbers” section for ordering.

The mask-programmable ROM in the associated TMS370C06x devices is replaced in the TMS370C76x with

32K or 48K bytes of EPROM while all the other available memory and on-chip peripherals are identical.

One-time-programmable (OTP) (TMS370C768 and TMS370C769) and reprogrammable devices (SE370C768

and SE370C769) are available.

TMS370C768 and TMS370C769 are OTP devices that are available in plastic packages. This microcomputer

is effective to use for immediate production updates for other members of the TMS370Cx6x family or for

low-volume production runs when the mask charge or cycle time for low-cost mask-ROM devices is not

practical.

The SE370C768 and SE370C769 have windowed ceramic packages to allow reprogramming of the program

EPROM memory during the development / prototyping phase of design. The SE370C768 and SE370C769

devices allow quick updates to breadboards and prototype systems while iterating initial designs.

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