Example Of Wait Occurrence - NEC 78K0 User Manual

30.3 Example of Wait Occurrence

<1> Watchdog timer
<On execution of MOV WDTM, A>
Number of execution clocks: 8
(5 clocks when data is written to a register that does not issue a wait (MOV sfr, A).)
<On execution of MOV WDTM, #byte>
Number of execution clocks: 10
(7 clocks when data is written to a register that does not issue a wait (MOV sfr, #byte).)
<2> Serial interface UART6
<On execution of MOV A, ASIS6>
Number of execution clocks: 6
(5 clocks when data is read from a register that does not issue a wait (MOV A, sfr).)
<3> A/D converter
Table 30-2. Number of Wait Clocks and Number of Execution Clocks on Occurrence of Wait (A/D Converter)
<On execution of MOV ADM, A; MOV ADS, A; or MOV A, ADCR>
• When f
= 10 MHz, t
X CPUL
Value of Bit 5 (FR2)
of ADM Register
0
1
Note On execution of MOV A, ADCR
Remark The clock is the CPU clock (f
f : X1 input clock frequency
X
t : Low-level width of CPU clock
CPUL
CHAPTER 30 CAUTIONS FOR WAIT
= 50 ns
f Number of Wait Clocks
CPU
f 9 clocks
X
f /2 5 clocks
X
2
f /2 3 clocks
X
3
f /2 2 clocks
X
4
f /2 0 clocks (1 clock
X
f 5 clocks
X
f /2 3 clocks
X
2
f /2 2 clocks
X
3
f /2 0 clocks (1 clock
X
4
f /2 0 clocks (1 clock
X
).
CPU
User's Manual U16227EJ2V0UD
Number of Execution Clocks
14 clocks
10 clocks
8 clocks
7 clocks
Note
) 5 clocks (6 clocks
10 clocks
8 clocks
7 clocks
Note
) 5 clocks (6 clocks
Note
) 5 clocks (6 clocks
Note
)
Note
)
Note
)
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