Renesas M16C/6NK Informações Técnicas Página 367

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Rev.2.10 Apr 14, 2006 page 343 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 23. Usage Notes
When entering medium-speed mode after transferring to stop mode from low-speed mode and low
power dissipation mode, write the MOV instruction (MOV.W #IMM16, abs16) as described below.
When entering stop mode and exiting from stop mode, DMA transfer must be disabled.
Change the
src
value (marked as #2118) depending on your usage condition.
MOV.W #2118H,CM0 ; Stop mode setting [#IMM16, abs16]
JMP.S L1 ;
L1:
NOP ; Countermeasure to avoid the program from
NOP ; stopping by reading instruction ahead
NOP ; (insert 4 or more NOPs)
NOP ;
Wait until the main clock oscillation stabilizes, before switching the clock source for CPU clock to the main
clock.
Similarly, wait until the sub clock oscillation stabilizes, before switching the clock source for CPU clock to
the sub clock.
Suggestions to reduce power consumption.
Ports
The processor retains the state of each I/O port even when it goes to wait mode or to stop mode.
A current flows in active I/O ports. A pass current flows in input ports that high-impedance state.
When entering wait mode or stop mode, set non-used ports to input and stabilize the potential.
A/D converter
When A/D conversion is not performed, set the VCUT bit in the ADCON1 register to 0 (VREF not connection).
When A/D conversion is performed, start the A/D conversion at least 1 µs or longer after setting the VCUT
bit to 1 (VREF connection).
D/A converter
When not performing D/A conversion, set the DAiE bit (i = 0, 1) in the DACON register to 0 (input
disabled) and DAi register to 00h.
Switching the oscillation-driving capacity
Set the driving capacity to LOW when oscillation is stable.
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