TMP86FS28DFG datasheet(64/272 Pages) TOSHIBA

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Page 52

5. I/O Ports

TMP86FS28DFG

Each output port contains a latch for holding output data. All input ports do not have latches, making it necessary

to externally hold input data until it is read externally or to read input data multiple times before it is processed. Fig-

ure 5-1 shows input/output timings.

External data is read from an input/output port in the S1 state of the read cycle in instruction execution. Since this

timing cannot be recognized externally, transient input such as chattering must be processed by software. Data is out-

put to an input/output port in the S2 state of the write cycle in instruction execution.

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

Figure 5-1 Input/Output Timings (Example)

Instruction

execution cycle

Input strobe

Data input

Ex: LD A, (x)

Fetch cycle

Read cycle

S0 S1 S2 S3 S0 S1 S2 S3 S0 S1 S2 S3

Instruction

execution cycle

Output latch pulse

Data output

Ex: LD (x), A

Fetch cycle

Write cycle

S0 S1 S2 S3 S0 S1 S2 S3 S0 S1 S2 S3

(a) Input timing

(b) Output timing

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