TMS370 datasheet(18/66 Pages) TI

18 / 66 page

TMS370Cx4x

8-BIT MICROCONTROLLER

SPNS016C – NOVEMBER 1992 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

digital port control registers

Peripheral file frame 2 contains the digital I/O pin configuration and control registers. Table 11 and Table 12

detail the specific addresses, registers, and control bits within the peripheral file frame.

Table 11. Peripheral File Frame 2: Digital Port Control Registers

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

REG

P020

Reserved

APORT1

P021

Port A Control Register 2 (must be 0)

APORT2

P022

Port A Data

ADATA

P023

Port A Direction

ADIR

P024

Reserved

BPORT1

P025

—

Port B Control Register 2 (must be 0)

BPORT2

P026

—

Port B Data

BDATA

P027

—

Port B Direction

BDIR

P028

P02B

Reserved

P02C

Port D Control Register 1 (must be 0)

—

DPORT1

P02D

Port D Control Register 2 (must be 0)†

—

DPORT2

P02E

Port D Data

—

DDATA

P02F

Port D Direction

—

DDIR

† To configure pin D3 as SYSCLK, set port D control register 2 = 08h.

Table 12. Port Configuration Register Setup

PORT

abcd

00q1

abcd

00y0

0 – 7

Data Out q

Data In y

0 – 2

Data Out q

Data In y

3 – 7

Data Out q

Data In y

a = Port

× Control Register 1

b = Port

× Control Register 2

c = Data

d = Direction

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