TMS370 datasheet(15/73 Pages) TI

15 / 73 page

TMS370Cx6x

8-BIT MICROCONTROLLER

SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

program EPROM (continued)

Table 8. EPROM Memory Map

’767

’768

’769

EPROM

size

24K Bytes

32K Bytes

48K Bytes

Memory

mapped

16K

2000h – 5FFFh

6000h– 7FFFh

First 16K

2000h – 5FFFh

Second 16K

6000h – 9FFFh

First 16K

2000h – 5FFFh

Second 16K

6000h – 9FFFh

Third 16K

A000h – DFFFh

Contol

registers

EPCTLL

P01E

EPCTLM

P01C

EPCTLL

P01E

EPCTLM

P01C

EPCTLL

P01E

EPCTLM

P01C

EPCTLH

P014

The EPROM memory map in Table 8 expresses the following:

–

For the 24K-byte EPROM, the 16K-byte array is controlled by EPCTLL register, located at 101Eh

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

–

For the 32K-byte EPROM, the first 16-byte array is controlled by EPCTLL register, located at 101Eh

(P01E); the second 16K-byte array is controlled by EPCTLM register, located at 101Ch (P01C).

–

For the 48K-bytes EPROM, the first 16K-byte array is controlled by EPCTLL register, located at 101Eh

(P01E); the second 16K-byte array is controlled by EPCTLM register, located at 101Ch (P01C); the third

16K-byte array is controlled by EPCTLH register, located at 1014h (P014).

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

EPROM is controlled by the EPCTL. The program EPROM modules’ features include:

D Programming

–

In-circuit programming capability if VPP is applied to MC

–

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

(EPCTLL, EPCTLM, and EPCTLH) located in the PF frame as shown in Table 7.

–

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, 32K or 48K 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. Table 9 shows the program ROM memory map.

Table 9. ROM Memory Map†

‘067

’068

‘069

ROM Size

24K Bytes

32K Bytes

48K Bytes

Memory Mapped

2000h – 7FFFh

2000h – 9FFFh

2000h – DFFFh

† Memory addresses 7FE0h through 7FEBh are reserved for Texas Instruments Incorporated. Memory addresses 7FBEh through 7FBFh and

7FECh through 7FFFh are reserved for interrupts and reset vectors. Trap vectors, used with TRAP0 through TRAP15 instructions, are located

at addresses 7FC0h and 7FCFh.

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