M32C8A Datasheet, PDF (56/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
6. Power Supply Voltage Detection Function
Vdet4 Detection Interrupt Register⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
D4INT
Address
002Fh
After Reset
XX00 0000b
Bit Symbol
Bit Name
Function
RW
D40
Vdet4 detection interrupt
enable bit⁽²⁾
0: Vdet4 detection interrupt disabled
1: Vdet4 detection interrupt enabled
RW
0: Vdet4 detection interrupt is not used to exit
D41
Wait mode/Stop mode exit
control bit⁽³⁾
wait/stop mode
1: Vdet4 detection interrupt is used to exit
RW
wait/stop mode
D42
Voltage change detect flag^{(4, 5)}
0: Not detected
1: Voltage crosses Vdet4
RW
D43
WDT underflow detect flag⁽⁵⁾
0: Not detected
1: Detected
RW
DF0
b5 b4
RW
0 0: CPU clock divided-by-8
Sampling clock select bits
0 1: CPU clock divided-by-16
1 0: CPU clock divided-by-32
DF1
1 1: CPU clock divided-by-64
RW
−
(b7-b6)
Unimplemented.
Read as undefined value.
−
NOTES:
1. Set the D4INT register after the PRC3 bit in the PRCR register is set to 1 (write enable).
2. Use the following procedure to set the D40 bit to 1:
(1) Set the VC27 bit in the VCR2 register to 1
(2) Wait for td(E-A) before the voltage detection circuit starts operating
(3) Wait for required sampling time (See Table "Sampling Period")
(4) Set the D40 bit to 1
3. If the Vdet4 detection interrupt has been used to exit wait mode or stop mode, set the D41 bit to 0 and then set it to 1 to use the
Vdet4 detection interrupt again to exit these modes.
4. The D42 bit is enabled when the VC27 bit is set to 1 (Vdet4 detection function used ). The D42 bit becomes 0 when the VC27 bit
is set to 0 (Vdet4 detection function not used).
5. The D43 bit can be set to 0 by program. Writing a 0 has no effect.
Figure 6.3 D4INT Register
Rev.1.00 Jul 15, 2007 Page 39 of 352
REJ09B0385-0100