TMS77C82 datasheet(8/49 Pages) TI

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TMS370Cx0x

8-BIT MICROCONTROLLER

SPNS029C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

central processing unit (CPU) (continued)

7000h

256-Byte RAM

(Register File / Stack)

Peripheral File

Reserved†

256-Byte Data EEPROM

Reserved†

System Control

Digital Port Control

Timer 1 Peripheral Control

Vectors

Not Available‡

Reserved†

0000h

0100h

00FFh

1010h

105Fh

1060h

1EFFh

1F00h

1FFFh

2000h

5FFFh

6000h

6FFFh

77FFh

7800h

FFFFh

100Fh

8K-Byte ROM / EPROM

(6000h – 7FFFh)

Interrupts and Reset Vectors;

Trap Vectors

7FBFh

7FC0h

7FFFh

8000h

Peripheral File Control Registers

Not Available‡

1010h – 101Fh

1020h – 102Fh

1040h – 104Fh

1030h – 103Fh

SCI1 Peripheral Control

1050h – 105Fh

Trap 15 – 0

7FC0h – 7FDFh

Reserved†

7FE0h – 7FEFh

Serial Communications Interface TX

7FF0h – 7FF1h

Serial Communications Interface RX

7FF2h – 7FF3h

Timer 1

7FF4h – 7FF5h

Reserved†

7FF6h – 7FF7h

Interrupt 3

7FF8h – 7FF9h

Interrupt 2

7FFAh – 7FFBh

Interrupt 1

7FFCh – 7FFDh

Reset

7FFEh – 7FFFh

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

‡ Not available means the address space is not accessible.

Figure 3. TMS370Cx0x 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 TMS370Cx0x devices contain 256 bytes of internal memory-mapped

RAM beginning at location 0000h (R0) and continuing through location 00FFh (R255) which is shown in

Figure 1.

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 TMS370Cx0x 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 TMS370Cx0x PF address map.

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