TMP88CS38FG datasheet(48/226 Pages) TOSHIBA

48 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-48

2.2.3

Port P4 (P47 to P40)

Port P4 is an 8-bit input/output port which can be configured as an input or an output in

one-bit unit under software control. Input/output mode is specified by the corresponding bit

in the port P4 input/output control register (P4CR). Port P4 is configured as an input if its

corresponding P4CR bit is cleared to “0”, and as an output if its corresponding P4CR bit is

set to “1”. During reset, P4CR is initialized to “0”, which configures port P4 as an input. The

P4 output latches are also initialized to “1”. Data is written into the output latch regardless

of the P4CR contents. Therefore initial output data should be written into the output latch

before setting P4CR.

Port P4 is also used as a pulse width modulation (PWM) output. When used as a PWM

output pin, the output pins should be set to the output mode and beforehand the output

latch should be set to “1”.

Note:

Input mode port is read the state of input pin. When input/output mode is used mixed,

the contents of output latch setting input mode may be changed by executing bit

manipulation instructions.

(00004H)

P47

PWM

P46

PWM

P45

PWM

P44

PWM

P43

PWM

P42

PWM

P41

PWM

P40

PWM

(Initial value: 1111 1111)

P4CR

(0000CH)

P47CR

P46CR

P45CR

P44CR

P43CR

P42CR

P41CR

P40CR

(Initial value: 0000 0000)

P4CR

I/O control for port P4

0: Input mode

1: Output mode

Write

only

Note 1:

= 7 to 0.

Note 2:

P4CR cannot used the read-modify-write instructions.

(Bit manipulation instructions such as SET, CLR, etc. and logical operation such as AND, OR, etc.)

Figure 2.2.4 Port P4 and P4CR

Data output

STOP

OUTEN

Output latch

P4i

PWMi

P4iCR

Data input

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