TMS320F243FN datasheet(23/116 Pages) TI

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TMS320F243, TMS320F241

DSP CONTROLLERS

SPRS064B – DECEMBER 1997 – REVISED FEBRUARY 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

software-controlled wait-state generator (continued)

Table 6. Visibility Modes

BIT 10

BIT 9

VISIBILITY MODE

Bus visibility OFF (reduces power consumption and noise)

Data-address bus output to external address bus.

Data-data bus output to external data bus.

Program-address bus output to external address bus.

Program-data bus output to external data bus.

digital I/O and shared pin functions

The ’F243 has a total of 32 general-purpose, bidirectional, digital I/O (GPIO) pins that function as follows: six

pins are dedicated I/O pins (see Table 7) and 26 pins are shared between primary functions and I/O. The ’F241

has 26 I/O pins; all are shared with other functions. The digital I/O ports module provides a flexible method for

controlling both dedicated I/O and shared pin functions. All I/O and shared pin functions are controlled using

eight 16-bit registers. These registers are divided into two types:

D Output Control Registers — used to control the multiplexer selection that chooses between the primary

function of a pin or the general-purpose I/O function.

D Data and Control Registers — used to control the data and data direction of bidirectional I/O pins.

Table 7. Dedicated I/O Pins (’F243 Only)

’F243 PIN NUMBER

PIN NAME

IOPD2

IOPD3

IOPD4

IOPD5

IOPD6

IOPD7

description of shared I/O pins

The control structure for shared I/O pins is shown in Figure 4, where each pin has three bits that define its

operation:

D Mux control bit — this bit selects between the primary function (1) and I/O function (0) of the pin.

D I/O direction bit — if the I/O function is selected for the pin (mux control bit is set to 0), this bit determines

whether the pin is an input (0) or an output (1).

D I/O data bit — if the I/O function is selected for the pin (mux control bit is set to 0) and the direction selected

is an input, data is read from this bit; if the direction selected is an output, data is written to this bit.

The mux control bit, I/O direction bit, and I/O data bit are in the I/O control registers.

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