M16C65 Datasheet, PDF (126/829 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
7.4.3 Voltage Detection 1 Circuit
When the VW12E bit in the VWCE register is 1 (voltage detection 1 and 2 circuits enabled) and the
VC26 bit in the VCR2 register is 1 (voltage detection 1 circuit enabled), the voltage detection 1 circuit
monitors the voltage applied to the VCC1 pin and detects whether the voltage passes Vdet1 by rising or
falling.
Voltage monitor 1 interrupt/reset generator
Voltage detection 1 circuit _fOCO-S
VC26
VW1F1 to VW1F0
00b
01b
10b
1/2 1/2 1/2 ^11b
VCC1 +
Internal
reference
-
voltage
Voltage
detection
1 signal
VW1C3
Digital
VfilWte1r C1
0 ^VW1C1 VW1C2
1
The voltage detection 1 signal
becomes high level when the VC26
bit is set to 0 (disabled).
VW1C7
VW1C6
VW1C0
VW1C0 to VW1C3, VW1F0 to VW1F1, VW1C6 to VW1C7 : Bits in the VW1C register
VC26 : Bit in the VCR2 register
Figure 7.5 Voltage Monitor 1 Interrupt/Reset Generator
Watchdog timer
interrupt signal
Voltage monitor
1 interrupt signal
Voltage monitor Non-maskable
2 interrupt signal interrupt signal
Oscillation stop
detection
interrupt signal
Voltage monitor 1 reset signal
7.4.3.1 Monitoring Vdet1
Set the VW12E bit in the VWCE register to 1 (voltage detection 1 and 2 circuits enabled) and the
VC26 bit in the VCR2 register to 1 (voltage detection 1 circuit enabled). Vdet1 can be monitored by
using the VW1C3 bit in the VW1C register after td(E-A) elapses.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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