CHAPTER 25 CAUTIONS FOR WAIT
Preliminary User’s Manual U16846EJ1V0UD
387
25.3 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 25-2. 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
X
= 10 MHz, t
CPUL
= 50 ns
Value of Bit 5 (FR2)
of ADM Register
f
CPU
Number of Wait Clocks
Number of Execution Clocks
f
X
9 clocks
14 clocks
f
X
/2
5 clocks
10 clocks
f
X
/2
2
3 clocks
8 clocks
f
X
/2
3
2 clocks
7 clocks
0
f
X
/2
4
0 clocks (1 clock
Note
)
5 clocks (6 clocks
Note
)
f
X
5 clocks
10 clocks
f
X
/2
3 clocks
8 clocks
f
X
/2
2
2 clocks
7 clocks
f
X
/2
3
0 clocks (1 clock
Note
)
5 clocks (6 clocks
Note
)
1
f
X
/2
4
0 clocks (1 clock
Note
)
5 clocks (6 clocks
Note
)
Note On execution of MOV A, ADCR
Remark The clock is the CPU clock (f
CPU
).
f
X
:
High-speed system clock oscillation frequency
t
CPUL
: Low-level width of CPU clock
