TMS370 datasheet(9/60 Pages) TI

9 / 60 page

TMS370Cx2x

8-BIT MICROCONTROLLER

SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

memory map (continued)

256-Byte RAM (Register File/Stack)

Reserved†

Peripheral File

Reserved†

256-Byte Data EEPROM

Not Available‡

8K-Byte

7FC0h

Trap 15–0

7FECh

Serial Communication Interface RX

7FEEh

Timer 1

7FF0h

Interrupt 3

7FF2h

Interrupt 2

7FF4h

Interrupt 1

7FF8h

Reset

1000h

Reserved†

1010h

System Control

1020h

Digital Port Control

1030h

1040h

Timer 1 Control

Vectors

7FDFh

7FEFh

7FF1h

7FF3h

7FF5h

7FF7h

7FF9h

100Fh

101Fh

102Fh

103Fh

104Fh

–

Program Memory

(ROM/EPROM)

Not Available‡

SPI Control

Reserved†

Serial Communication Interface TX

7FFAh

7FFBh

–

7FFCh

7FFDh

–

7FFEh

7FFFh

–

1050h

1060h

105Fh

10FFh

–

0000h

0100h

00FFh

1000h

10FFh

1100h

1EFFh

1F00h

1FFFh

2000h

5FFFh

6000h

6FFFh

7000h

7FFFh

8000h

FFFFh

0FFFh

Reserved†

SCI1 Control

7FEDh

–

7FF6h

Serial Peripheral Interface

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

‡ Not available means the address space is not accessible.

Figure 3. TMS370Cx2x 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 stack instructions. The TMS370Cx2x contains 256 bytes of internal RAM mapped beginning at

location 0000h (R0) and continuing through location 00FFh (R255).

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.

peripheral file (PF)

The TMS370Cx2x control registers contain all the registers necessary to operate the system and peripheral

modules on the device. The instruction set includes some instructions that access the PF directly. These

instructions designate the register by the number of the PF relative to 1000h, preceded by P0 for a hexadecimal

designator or P for a decimal designator. For example, the system-control register 0 (SCCR0) is located at

address 1010h; its peripheral file hexadecimal designator is P010, and its decimal designator is P16. Table 4

shows the TMS370Cx2x PF address map.

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