M16C62P_06 Datasheet, PDF (61/421 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

M16C/62P Group (M16C/62P, M16C/62PT)
6. Voltage Detection Circuit
Voltage Detection Register 1
b7 b6 b5 b4 b3 b2 b1 b0
0000 000
Symbol
Address
After Reset ⁽²⁾
VCR1
Bit Symbol
0019h
Bit Name
00001000b
Function
RW
—
Reserved Bit
Set to “0”
RW
(b2-b0)
Low Voltage Monitor Flag ⁽¹⁾
0 : VCC1 < Vdet4
VC13
1 : VCC1 ≥ Vdet4
RO
—
Reserved Bit
Set to “0”
RW
(b7-b4)
NOTES :
1. The VC13 bit is useful w hen the VC27 bit in the VCR2 register is set to “1” (low voltage detection circuit enable).
The VC13 bit is alw ays “1” (VCC1 ≥ Vdet4) w hen the VC27 bit is set to “0” (low voltage detection circuit disable).
2. This register dose not change at softw are reset, w atchdog timer reset and oscillation stop detection reset.
Voltage Detection Register 2 ⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
000000
Symbol
Address
VCR2
001Ah
Bit Symbol
Bit Name
—
Reserved Bit
(b5-b0)
Reset Level Monitor Bit ^{(2, 3, 6)}
VC26
Low Voltage Monitor Bit ^{(4, 6)}
VC27
NOTES :
After Reset ⁽⁵⁾
00h
Function
RW
Set to “0”
RW
0 : Disable reset level detection circuit
1 : Enable reset level detection circuit
RW
0 : Disable low voltage detection circuit
1 : Enable low voltage detection circuit
RW
1. Write to this register after setting the PRC3 bit in the PRCR register to “1” (w rite enable).
2. To use low voltage detection (hardw are reset 2), set the VC26 bit to “1” (reset level detection circuit enable).
3. VC26 bit is disabled in stop mode (the microcomputer is not reset even if the voltage input to VCC1 pin becomes
low er than Vdet3).
4. Where the VC13 bit in the VCR1 register and D42 bit in the D4INT register are used or the D40 bit is set to “1” (low
voltage detection interrupt enable), set the VC27 bit to “1” (low voltage detection circuit enable).
5. This register dose not change at softw are reset, w atchdog timer reset and oscillation stop detection reset.
6. The detection circuit dose not start operation until td(E-A) elapses after the VC26 bit, or VC27 bit is set to “1”.
Figure 6.2 VCR1 and VCR2 Registers
Rev.2.41 Jan 10, 2006 Page 46 of 390
REJ09B0185-0241