TMP89FH46 datasheet(97/390 Pages) TOSHIBA

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Page 83

TMP89FH46

RA005

8. I/O Ports

Note: P00 and P01 pins can not be used for the I/O port, because they should be connected with the high frequency OSC

input.

Each output port contains a latch, which holds the output data. No input port has a latch, so the external input data

should be externally held until the input data is read from outside or reading should be performed several times

before processing. Figure 8-1 shows input/output timing examples.

External data is read from an I/O port in the read cycle during execution of the read instruction. This timing cannot

be recognized from outside, so that transient input such as chattering must be processed by the program. Data is out-

put to an I/O port in the next cycle of the write cycle during execution of the write instruction.

Figure 8-1 Input/Output Timing (Example)

Note: The positions of the read and write cycles may vary, depending on the instruction.

Table 8-1

List of I/O Ports

Port name

Pin name

Number of pins

Input/output

Secondary functions

Port P0

P03 to P00

(Note)

Input/output

Also used as the high-frequency oscillator connection pin and the

low-frequency oscillator connection pin

Port P1

P13 to P10

Input/output

Also used as the external reset input, the external interrupt input and

the STOP mode release signal input

Port P2

P27 to P20

Input/output

Also used as the UART input/output, the serial interface input/output

and the serial bus interface input/output

Port P4

P47 to P40

Input/output

Also used as the analog input and the key-on wakeup input

Port P7

P77 to P70

Input/output

Also used as the timer counter input/output, the divider output and

the external interrupt input

Port P8

P83 to P80

Input/output

Also used as the timer counter input/output

Port P9

P91 to P90

Input/output

Also used as the UART input/output

Port PB

PB7 to PB4

Input/output

Also used as the UART input/output and the serial interface input/out-

put

Instruction

execution cycle

System clock

Internal read

signal

Data input

Example: LD A, (x)

Fetch cycle

Read cycle

Instruction

execution cycle

Internal write

signal

Data input

Example: LD (x), A

Fetch cycle

(a) Input timing

Write cycle

(b) Input timing

System clock

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