M32C8A Datasheet, PDF (109/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
9. Clock Generation Circuits
9.5.3.2 Pin States in Stop Mode
Table 9.8 lists pin states in stop mode.
Table 9.8 Pin States in Stop Mode
Pin
States
Address Bus, Data Bus, CS0 to CS3, BHE
Maintain the state immediately before entering stop mode
RD, WR, WRL, WRH
“H”
HLDA, BCLK
“H”
ALE
“H”
Ports
Maintain the state immediately before entering stop mode
CLKOUT
When fC is selected
“H”
When f8, f32 are selected The clock is stopped and holds the level immediately before
entering stop mode
XIN
Placed in a high-impedance state
XOUT
“H”
XCIN, XCOUT
Placed in a high-impedance state
9.5.3.3 Exiting Stop Mode
Stop mode is exited by the hardware reset 1, NMI interrupt, Vdet4 detection interrupt, or peripheral function
interrupts. The following are the peripheral function interrupts that can be used to exit stop mode.
• Key input interrupt
• INT interrupt
• Timer A and timer B interrupts
(Available when the timer counts external pulse having 100-Hz frequency or below in event counter mode)
When only the hardware reset 1, NMI interrupt, or Vdet4 detection interrupt are used to exit stop mode, set bits
ILVL2 to ILVL0 in the Interrupt Control Registers for all the peripheral function interrupts to 000b (interrupt
disabled) before setting the CM10 bit in the CM1 register to 1 (all clocks stop).
If the voltage applied to pins VCC1 and VCC2 drops below 3.0 V in stop mode, exit stop mode by the hardware
reset 1 after the voltage has satisfied the recommended operating conditions.
Rev.1.00 Jul 15, 2007 Page 92 of 352
REJ09B0385-0100