PD178046_15 Datasheet, PDF (24/42 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD178046, 178048
Figure 3-7. Block Diagram of Watchdog Timer
fX/2⁸
Clock input
control circuit
Divider
Divided clock
select circuit
RUN
Division mode
select circuit
3
Output
control
circuit
OSTS2 OSTS1 OSTS0 WDCS2 WDCS1 WDCS0
RUN WDTM4 WDTM3
Oscillation stabilization
time select register (OSTS)
Watchdog timer clock
select register (WDCS)
Watchdog timer
mode register
(WDTM)
Internal bus
3.4 A/D Converter
An A/D converter with a resolution of 8 bits and 4 channels is provided.
Figure 3-8. Block Diagram of A/D Converter
INTWDT
RESET
WDT mode signal
ANI0/P10
ANI1/P11
ANI2/P12
ANI3/P13
Sample & hold circuit
Voltage comparator
Successive approxima-
tion register (SAR)
VDD
ADCS3
GND0,
GND1
Control
circuit
INTAD
A/D conversion result
Control
circuit
Voltage
comparator
Power-fail comparison threshold
4
register (ADCR3)
value register 3 (PFT3)
ADS33 ADS32 ADS31 ADS30 ADCS3 0
Analog input channel
specification register 3 (ADS3)
FR32 FR31 FR30 0
0
0
A/D converter mode
register 3 (ADM3)
Internal bus
PFEN3 PFCM3 PFHRM3
Power-fail comparison
mode register 3 (PFM3)
22
Preliminary Product Information