TMP93CS44 datasheet(68/224 Pages) TOSHIBA

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TMP93CS44/S45

2004-02-10

93CS44-66

3.5.7

Port 6 (P60 to P67)

•

Ports 60 to 65

Ports 60 to 65 are a 6-bit general-purpose I/O port. I/Os can be set on a bit basis.

Resetting sets P60 to P65 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, P60 to P65 can also share

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

the Port 6 function register (P6FC) enables this function.

Resetting sets the function register value to 0 and sets all bits to input ports.

•

Port 66 and port 67

Port 66 and port 67 are a 2-bit general-purpose I/O port. I/Os can be set on a bit

basis.

The output buffer for P66, P67 is an open-drain type buffer.

Resetting outputs high-impedance (High-Z) because output latch and control

In addition to functioning as a general-purpose I/O port, P66, P67 can also function

as a low-frequency oscillator connecting pin (XT1, XT2) for dual clock mode. The dual

clock function can be set by programming system clock control registers SYSCR0,

SYSCR1.

(1) Port 60 (TXD0) and port 63 (TXD1)

Port 60 and port 63 also function as serial channel TXD output pins in addition to I/O

ports.

They have a programmable open-drain function.

Figure 3.5.15 Ports 60 and 63

Direction control

(on bit basis)

Reset

P6CR write

P6 write

P6 read

Open-drain

possible

ODE<ODE63:60>

P60 (TXD0)

P63 (TXD1)

Function control

(on bit basis)

P6FC write

Programmable

pull up

P-ch

TXD0, TXD1

Output latch

Selector

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