TMP93CS40 datasheet(80/248 Pages) TOSHIBA

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TMP93CS40/TMP93CS41

2004-02-10

93CS40-78

3.5.10

Port 9 (P90 to P97)

•

Ports 90 to 95

Ports 90 to 95 constitute a 6-bit general-purpose I/O ports. I/Os can be set on a bit

basis.

Resetting sets P90 to P95 to an input port and connects a pull-up resistor.

It also sets all bits of the output latch register to 1.

In addition to functioning as a general-purpose I/O port, P90 to P95 can also function

as an I/O for serial channels 0 and 1. Writing “1” in the corresponding bit of the port 9

function register (P9FC) enables those functions.

Resetting resets the function register P9CR, P9FC value to “0” and sets all bits to

input ports.

•

Ports 96 to 97

Ports 96 to 97 form a 2-bit general-purpose I/O port. I/Os can be set on a bit basis.

The output buffer for P96 to P97 is an open-drain type buffer.

Resetting sets the output latch and control registers to “1” and outputs

high-impedance (High-Z).

In addition to functioning as a general-purpose I/O port, P96 to P97 can also function

as a low-frequency oscillator connecting pin for dual clock mode. The dual clock

function can be set by programming system clock control register SYSCR0 and 1.

(1) Ports 90, 93 (TXD0/TXD1)

Ports 90 and 93 also function as serial channel TXD output pins in addition to I/O

ports.

They have a programmable open-drain function.

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