TMS370 datasheet(12/59 Pages) TI

12 / 59 page

TMS370Cx7x

8-BIT MICROCONTROLLER

SPNS034C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

data EEPROM (continued)

Table 5. Data EEPROM and Program EPROM Control Registers Memory Map

ADDRESS

SYMBOL

NAME†

101Ah (P01A)

DEECTL

Data EEPROM control register

101Bh (P01B)

Reserved

101Ch (P01C)

EPCTLM

Program EPROM control register – middle array

101Dh (P01D)

Reserved

101Eh (P01E)

EPCTLL

Program EPROM control register – low array

†For the 24K-byte EPROM device, the program memory is controlled by P01C and P01E.

program EPROM

The TMS370C777 contains 24K bytes of program EPROM made up of one 16K-byte array and one 8K-byte

array. The 16K-byte array is located at address locations 2000h through 5FFFh, and the 8K-byte array is located

at address locations 6000h through 7FFFh, as shown in Table 6.

Table 6. TMS370C777 EPROM Memory Map

PARAMETER

VALUE

EPROM size

24K Bytes

Memory mapped

16K Bytes at 2000h – 5FFFh

8K Bytes at 6000h – 7FFFh

Control registers

EPCTLL (P01E)

EPCTLM (P01C)

As shown in Table 6 for the two EPROM areas, the 16K-byte array is controlled by register EPCTLL located at

101Eh (P01E), and the 8K-byte array is controlled by register EPCTLM located at 101Ch (P01C).

Reading the program-EPROM modules is identical to reading other internal memory. During programming, the

EPROM is controlled by the program EPROM control registers EPCTLL and EPCTLM. The program EPROM

modules’ features include:

D Programming

–

In-circuit programming capability if VPP is applied to the MC pin

–

Control register: Program EPROM programming is controlled by the program EPROM control registers

EPCTLL and EPCTLM, located at the addresses in PF frame 1 as shown in Table 5.

–

Programming one EPROM module while executing the other

D Write-protection: Writes to the program EPROM are disabled under the following conditions:

–

Reset: All programming to the EPROM module is halted.

–

Low-power modes

–

13 V not applied to MC

program ROM

The program ROM consists of 24K bytes of mask-programmable ROM. The program ROM is used for

permanent storage of data or instructions. Programming of the mask ROM is performed at the time of device

fabrication. Memory addresses 7FE0h – 7FEBh is reserved for Texas Instruments (TI

™). 7FECh to 7FFFh are

reserved for interrupt and reset vectors. Trap vectors, used with TRAP0 through TRAP15 instructions, are

located between addresses 7FC0h and 7FDFh.

TI is a trademark of Texas Instruments Incorporated.

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