Digital Input/Output Port Input/Output Timing - NEC PD75402A User Manual

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.
(a) Data fetch by 1-machine-cycle instruction
(b) Data fetch by 2-machine-cycle instruction
Instruction
Execution
Input Timing
(c) Data latching by 1-machine-cycle instruction
(d) Data latching by 2-machine-cycle instruction
Instruction
Execution
Output Latch
(Output Pin)
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-9 Digital Input/Output Port Input/Output Timing
1-Machine Cycles
Instruction
Manipulation
Execution
Instruction
Input Timing
2-Machine Cycles
Manipulation Instruction
Instruction
Manipulation Instruction
Execution
Output Latch
(Output Pin)
Manipulation Instruction
3 0 1
0 1
53