NEC PD75P402 Manual do Utilizador descarregar pdf (Página 64)

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

5.1.6 Digital Input/Output Port Input/Output Timing

The timing for outputting data to the output latch and fetching pin data or output latch data onto the internal bus

is shown in Fig. 5-9.

Fig. 5-9 Digital Input/Output Port Input/Output Timing

(a) Data fetch by 1-machine-cycle instruction

(b) Data fetch by 2-machine-cycle instruction

(d) Data latching by 2-machine-cycle instruction

1-Machine Cycles

Manipulation

Instruction

Input Timing

Instruction

Execution

2-Machine Cycles

Manipulation Instruction

Instruction

Execution

Input Timing

Manipulation Instruction

Instruction

Execution

Output Latch

(Output Pin)

3

Φ

0

Φ

1

Φ

Manipulation Instruction

Instruction

Execution

Output Latch

(Output Pin)

0

Φ

1

Φ

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 194 195

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NEC PD75P402 Manual do Utilizador Página 64