TMS370 datasheet(8/50 Pages) TI

8 / 50 page

TMS370Cx1x

8-BIT MICROCONTROLLER

SPNS012F – MAY 1987 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

TMS370Cx1x CPU (continued)

256-Byte RAM

(Register File / Stack)

128-Byte RAM

(Register File / Stack)

Reserved†

Peripheral File

Reserved†

256-Byte Data EEPROM

Not Available‡

7FC0h

Trap 15 – 0

7FE0h

Reserved

7FF4h

Interrupt 3

Interrupt 2

Interrupt 1

Reset

1010h

1020h

System Control

Digital Port Control

1030h

1040h

Timer 1 Peripheral Control

Vectors

7FDFh

7FF3h

7FF5h

101Fh

102Fh

103Fh

104Fh

–

Not Available‡

SPI Control

Timer 1

Serial Peripheral Interface

7FFAh

7FFBh

–

7FFCh

7FFDh

–

7FFEh

7FFFh

–

0000h

0080h

007Fh

1010h

104Fh

1050h

1EFFh

1F00h

1FFFh

2000h

5FFFh

6000h

6FFFh

7000h

77FFh

7800h

FFFFh

100Fh

8K Bytes Start at 6000h

4K Bytes Start at 7000h

2K Bytes Start at 7800h

Interrupts and Reset Vectors;

Trap Vectors

7FBFh

7FC0h

7FFFh

8000h

7FF6h

7FF7h

–

7FF8h

7FF9h

–

Peripheral File Control Registers

0100h

00FFh

† Reserved means that the address space is reserved for future expansion.

‡ Not available means that the address space is not accessible.

Figure 3. TMS370Cx1x Memory Map

RAM / register file (RF)

Locations within the RAM address space can serve as the RF, general-purpose read / write memory, program

memory, or the stack instructions. The TMS370Cx10, TMS370Cx11, and TMS370C312 contain 128 bytes of

internal RAM mapped beginning at location 0000h (R0) and continuing through location 007Fh (R127) which

is shown in Table 4 along with ’712 devices.

Table 4. RAM Memory Map

’x10, ’x11 AND ’312

’712

RAM size

128 bytes

256 bytes

Memory mapped

0000h – 007Fh

0000h – 00FFh

The first two registers, R0 and R1, are also called register A and B, respectively. Some instructions implicitly

use register A or B; for example, the instruction LDSP (load SP) assumes that the value to be loaded into the

stack pointer is contained in register B. Registers A and B are the only registers cleared on reset.

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