M16C65 Datasheet, PDF (114/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
7. Voltage Detector
7.2.2 Voltage Detection Circuit Operation Enable Register (VCR2)
Voltage Detection Circuit Operation Enable Register
b7 b6 b5 b4 b3 b2 b1 b0
0000
Symbol
VCR2
Address
001Ah
After Reset
000X 0000b ⁽¹⁾
001X 0000b ⁽²⁾
Bit Symbol
Bit Name
Function
RW
—
(b3-b0)
Reserved bits
Set to 0
RW
—
(b4)
No register bit. If necessary, set to 0. Read as undefined value
—
VC25
Voltage detection 0 enable bit
0 : Disable voltage detection 0 circuit
1 : Enable voltage detection 0 circuit
RW
VC26
Voltage detection 1 enable bit
0 : Disable voltage detection 1 circuit
1 : Enable voltage detection 1 circuit
RW
VC27
Voltage detection 2 enable bit
0 : Disable voltage detection 2 circuit
1 : Enable voltage detection 2 circuit
RW
Notes :
1. When the LVDAS bit of address OFS1 is 1 at hardware reset
2. This value shows the value after any of the following resets:
- Voltage monitor 0 reset
- When the LVDAS bit of address OFS1 is 0 at hardware reset
- Power-on reset
Write to the VCR2 register after setting the PRC3 bit in the PRCR register to 1 (write enabled).
This register does not change at voltage monitor 1 reset, voltage monitor 2 reset, oscillation stop
detection reset, watchdog timer reset, or software reset.
VC25 (Voltage Detection 0 Enable Bit) (b5)
To use voltage monitor 0 reset, set the VC25 bit to 1 (voltage detection 0 circuit enabled). After
changing the VC25 bit to 1, the detection circuit starts operating when the td(E-A) elapses.
VC26 (Voltage Detection 1 Enable Bit) (b6)
The voltage detection 1 circuit is enabled when the VW12E bit in the VWCE register is set to 1 (voltage
detection 1 and 2 circuits enabled) and the VC26 bit is set to 1 (voltage detection 1 circuit enabled). Set
bits VW12E and VC26 to 1 under the following conditions:
• When using voltage monitor 1 interrupt/reset
• When using bits VW1C2 and VW1C3 in the VW1C register
The detection circuit does not start operation until td(E-A) elapses after the VC26 bit is changed from 0 to 1.
VC27 (Voltage Detection 2 Enable Bit) (b7)
The voltage detection 2 circuit is enabled when the VW12E bit in the VWCE register is set to 1 (voltage
detection 1 and 2 circuits enabled) and the VC27 bit is set to 1 (voltage detection 2 circuit enabled). Set
bits VW12E and VC27 to 1 under the following conditions:
• When using voltage monitor 2 interrupt/reset
• When using the VC13 bit in the VCR1 register
• When using the VW2C2 bit in the VW2C register
The detection circuit does not start operation until td(E-A) elapses after the VC27 bit is changed from 0 to 1.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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