M16C6NK Datasheet, PDF (91/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
8. Clock Generating Circuit
8.4.3 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 VCC is VRAM or more, the internal
RAM is retained.
However, the peripheral functions clocked by external signals keep operating.
Table 8.6 lists the interrupts to stop mode and use conditions.
Table 8.6 Interrupts to Stop Mode and Use Conditions
Interrupt
_______
NMI Interrupt
Can be used
Condition
Key Input Interrupt
______
INT Interrupt
Can be used
Can be used
Timer A Interrupt
Can be used
Timer B interrupt
(when counting external pulses in event counter mode)
Serial Interface Interrupt Can be used (when external clock is selected)
CAN0/1 Wake-up Interrupt Can be used (when CAN sleep mode is selected)
8.4.3.1 Entering Stop Mode
The microcomputer is placed into stop mode by setting the CM10 bit in the CM1 register to “1” (all clocks
turned off). At the same time, the CM06 bit in the CM0 register is set to “1” (divide-by-8 mode) and the
CM15 bit in the CM1 register is set to “1” (main clock oscillator circuit drive capability high).
Before entering stop mode, set the CM20 bit in the CM2 register to “0” (oscillation stop, re-oscillation
detection function disabled).
Also, if the CM11 bit in the CM1 register 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 in the PLC0 register to “0” (PLL turned off)
before entering stop mode.
8.4.3.2 Pin Status in Stop Mode
Table 8.7 lists the pin status in stop mode.
Table 8.7 Pin Status in Stop Mode
Pin
Memory Expansion Mode
Microprocessor Mode ⁽¹⁾
Single-chip Mode
A0 to A19, D0 to D15,
_______
_______ ________
CS0 to CS3, BHE ⁽²⁾
______ _______ _________ _________
RD, WR, WRL, WRH ⁽²⁾
___________
HLDA, BCLK ⁽²⁾
Retains status before stop mode Does not become a bus control pin
“H”
“H”
ALE ⁽²⁾
indeterminate
I/O ports
Retains status before stop mode Retains status before stop mode
CLKOUT When fC selected Does not become a CLKOUT pin “H”
When f8, f32
Retains status before stop mode
selected
NOTES:
1. Not available memory expansion and microprocessor modes in T/V-ver..
2. Not available the bus control pins in T/V-ver..
Rev.2.00 Nov 28, 2005 page 73 of 378
REJ09B0124-0200