TMS370Cx32

8-BIT MICROCONTROLLER

SPNS015C – FEBRUARY 1990 – REVISED FEBRUARY 1997

18

POST OFFICE BOX 1443

digital port control registers

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

addresses, registers, and control bits within this peripheral file frame. Table 12 shows the port configuration

register setup.

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

PF

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

P020

Reserved

APORT1

P021

Port A Control Register 2 (must be 0)

APORT2

P022

Port A Data

ADATA

P023

Port A Direction

ADIR

P024

to

P02B

Reserved

P02C

Port D Control Register 1

(must be 0)

—

Port D Control Register 1

(must be 0)

—

—

—

DPORT1

P02D

Port D Control Register 2

(must be 0)†

—

Port D Control Register 2

(must be 0)†

—

—

—

DPORT2

P02E

Port D Data

—

Port D Data

—

—

—

DDATA

P02F

Port D Direction

—

Port D Direction

—

—

—

DDIR

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

Table 12. Port Configuration Register Setup

PORT

PIN

abcd

00q1

abcd

00y0

A

0 – 7

Data out q

Data In y

D

3, 4, 6, 7

Data out q

Data In y

a = Port x Control Register 1

b = Port x Control Register 2

c = Data

d = Direction

programmable acquisition and control timer (PACT) module

Traditionally, timers in microcontrollers provide limited capture and compare functions consuming significant

CPU processing power, leading to inaccurate timings due to interrupt latencies. The programmable acquisition

and control timer (PACT8) acts as a coprocessor combining configurable capture and compare features, within

a flexible dual-port RAM, able to run real-time tasks with little or no CPU intervention. The PACT structure allows

concatenation of tasks, thus enabling the CPU to perform data manipulation while the PACT module both

captures and outputs real-time-related information. Since all the PACT control information is held within the

dual-port RAM, the CPU can access these parameters quickly.

To use the PACT, the user must set up three distinct areas of memory. The first is the dual-port RAM, which

contains the capture area, the commands, and the timer definitions. The second is the peripheral frame. The

third is an area near the end of the program memory which holds the interrupt vectors of PACT.