UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 247

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

11.1 Watchdog Timer Functions
(1) Watchdog timer
(2) Interval timer
The watchdog timer has the following functions.
Caution
Figure 11-1 shows a block diagram of the watchdog timer.
The watchdog timer detects a program loop. Upon detection of a program loop, a non-maskable interrupt request
or RESET can be generated.
For the loop detection time, see Table 11-2.
Interrupt requests are generated at the preset time intervals.
For the interval time, see Table 11-3.
Select the watchdog timer mode or the interval timer mode using the watchdog timer mode
f
register (WDTM). (The watchdog timer and the interval timer cannot be used simultaneously.)
X
/2
f
X
8
Watchdog timer clock
select register (WDCS)
Clock
input
controller
RUN
Figure 11-1. Watchdog Timer Block Diagram
CHAPTER 11 WATCHDOG TIMER
WDCS2 WDCS1 WDCS0
Division mode
selector
Divider
circuit
User’s Manual U14046EJ5V0UD
Internal bus
Watchdog timer mode
register (WDTM)
Divided
clock
selector
3
RUN WDTM4 WDTM3
Output
controller
INTWDT
RESET
WDT mode signal
245