m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 21

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

Reset
Voltage detection circuit
Figure 1.5.4. Reset circuit block
Figure 1.5.5. WDC register
The voltage detection circuit has monitoring circuits to check the input voltage of the V
circuits monitor the the input voltage at V
used to enable/disable these monitoring circuits.
The VDET3 monitoring circuit is used for detecting the minimum VCC that guarantees proper chip
operation.
The V
less than V
monitoring circuit, if enabled, can generate an interrupt.
RESET
V
CC
DET4
Note 1: The WDC5 bit is set to 0 immediately after power-on (cold start).
Note 2: The WDC5 bit will always be set to a 1 whenever the WDC SFR is written (regardless of value of WDC5 bit).
Preliminary Specifications Rev. 0.9
Watchdog timer control register
b7 b6 b5 b4 b3 b2 b1 b0
monitoring circuit can be set to detect whether the input voltage is equal to and greater or
DET4
Specifications in this manual are tentative and subject to change.
CM10 bit = 1
(stop mode)
0
depending on the value of VC13 bit of the VCR1 register. In addition, the V
VCR2 register
b7
b6
Bit symbol
High-order bit of watchdog timer
WDC5
WDC7
Symbol
WDC
Renesas Technology Corp.
Cold start / warm start
discrimination flag (Note 2)
Reserved bit
Prescaler select bit
DET3
Internal power on reset
Write to WDC register
+
+
>
≥
VDET3
VDET4
and V
E
E
Bit name
Address
000F
DET4
16
00?XXXXX
. Bits VC26 and VC27 of VCR2 register are
0 : Cold start
1 : Warm start
Set to 0
After reset
0 : Divided by 16
1 : Divided by 128
Noise rejection
2
(Note1)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Function
CK
WDC5 bit
S
R
1 shot
VCR1 register
VC13 bit
Q
Q
b3
Internal power
supply voltage
stable time
td(S-R)
WARM/COLD
(warm or cold start)
RW
RO
RW
RW
RW
VDET4 detect signal
CC
Internal reset
("L" active)
M16C/26 Group
pin. These
DET4
15