UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 250

• 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

11.4 Watchdog Timer Operations
11.4.1 Watchdog timer operation
detect a program loop.
register (WDCS). The watchdog timer starts by setting bit 7 (RUN) of WDTM to 1. After the watchdog timer is started,
set RUN to 1 within the set loop time interval. The watchdog timer can be cleared and counting is started by setting
RUN to 1.
is generated according to the value of WDTM bit 3 (WDTM3).
before the STOP mode is set, clear the watchdog timer and then execute the STOP instruction.
248
When bit 4 (WDTM4) of the watchdog timer mode register (WDTM) is set to 1, the watchdog timer is operated to
The loop detection time interval is selected with bits 0 to 2 (WDCS0 to WDCS2) of the watchdog timer clock select
If RUN is not set to 1 and the loop detection time is exceeded, system reset or a non-maskable interrupt request
The watchdog timer continues operating in the HALT mode but it stops in the STOP mode. Thus, set RUN to 1
Cautions 1. The actual loop detection time may be shorter than the set time by up to 2
Note Expanded-specification products of PD780024A, 780034A Subseries only.
Remark f
2. When the subsystem clock is selected for the CPU clock, the watchdog timer count operation
X
: Main system clock oscillation frequency
is stopped.
2
2
2
2
2
2
2
2
Loop Detection Time
12
13
14
15
16
17
18
20
/f
/f
/f
/f
/f
/f
/f
/f
X
X
X
X
X
X
X
X
Table 11-2. Watchdog Timer Loop Detection Time
CHAPTER 11 WATCHDOG TIMER
User’s Manual U14046EJ5V0UD
488 s
977 s
1.95 ms
3.91 ms
7.82 ms
15.6 ms
31.2 ms
125 ms
When Operated at
f
X
= 8.38 MHz
341 s
682 s
1.36 ms
2.73 ms
5.46 ms
10.9 ms
21.8 ms
87.3 ms
When Operated at
f
X
= 12 MHz
Note
8
/f
X
seconds.