Stop Mode - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

(3) Stop Mode

In stop mode, all oscillator circuits are turned off, so are the CPU clock and the peripheral function clocks.
Therefore, the CPU and the peripheral functions clocked by these clocks stop operating. The least
amount of power is consumed in this mode. If the voltage applied to V
is retained.
However, the peripheral functions clocked by external signals keep operating. The following interrupts
can be used to exit stop mode.
______
• NMI interrupt
• Key interrupt
______
• INT interrupt
• Timer A, Timer B interrupt (when counting external pulses in event counter mode)
• Serial I/O interrupt (when external clock is selected)
• CAN0 Wake-up interrupt
• Entering Stop Mode
The microcomputer is placed into stop mode by setting the CM10 bit of CM1 register to "1" (all clocks
turned off). At the same time, the CM06 bit of CM0 register is set to "1" (divide-by-8 mode) and the
CM15 bit of CM1 register is set to "1" (main clock oscillator circuit drive capability high).
Before entering stop mode, set the CM20 bit to "0" (oscillation stop, re-oscillation detection function
disabled).
Also, if the CM11 bit is "1" (PLL clock for the CPU clock source), set the CM11 bit to "0" (main clock for
the CPU clock source) and the PLC07 bit to "0" (PLL turned off) before entering stop mode.
• Pin Status During Stop Mode
Table 1.8.6 lists the pin status during stop mode.
Table 1.8.6 Pin Status During Stop Mode
Pin
A to A , D to D ,
0 19 0 15
_______ _______ ________
CS to CS , BHE
0 3
______ _______ _________ _________
RD, WR, WRL, WRH
___________
HLDA, BCLK
ALE
I/O ports
CLK When f selected
OUT
C
When f , f
8 32
selected
Rev.1.00 2003.05.30 page 59
Memory expansion mode
Microprocessor mode
Retains status before stop mode
"H"
"H"
"H"
Retains status before stop mode
-
-
Clock Generation Circuit
is V or more, the internal RAM
CC RAM
Single-chip mode
-
-
-
-
Retains status before stop mode
"H"
Retains status before stop mode