UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 245

• 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

10.4 Watch Timer Operations
10.4.1 Watch timer operation
main system clock or subsystem clock. The interrupt request is generated at the following time intervals:
operation starts, and when these bits are cleared to 0, the 5-bit counter is cleared and the count operation stops.
setting WTM1 to 1 after clearing it to 0. In this case, however, the 9-bit prescaler is not cleared. Therefore, an error
up to 2
10.4.2 Interval timer operation
of the preset count value.
(WTM).
WTM6
• If main system clock (8.38 MHz) is selected: 0.25 seconds
• If subsystem clock (32.768 kHz) is selected: 0.5 seconds
Remark f
Note Expanded-specification products of PD780024A, 780034A Subseries only.
Remark f
The watch timer generates an interrupt request (INTWT) at specific time intervals (2
When bit 0 (WTM0) and bit 1 (WTM1) of the watch timer operation mode register (WTM) are set to 1, the count
When the interval timer is simultaneously operated, a zero-second start can be achieved for the watch timer by
The watch timer operates as interval timer that generates interrupt requests (INTWTI) repeatedly at an interval
The interval time can be selected with bits 4 to 6 (WTM4 to WTM6) of the watch timer operation mode register
0
0
0
0
1
1
Other than above
9
/f
W
WTM5
seconds occurs in the first overflow (INTWT) after the zero-second start.
0
0
1
1
0
0
f
f
W
W
X
XT
: Main system clock oscillation frequency
: Watch timer clock frequency (f
: Watch timer clock frequency (f
: Subsystem clock oscillation frequency
WTM4
0
1
0
1
0
1
2
2
2
2
2
2
Setting prohibited
Interval
4
5
6
7
8
9
Time
/f
/f
/f
/f
/f
/f
W
W
W
W
W
W
Table 10-2. Interval Timer Interval Time
When Operated at
170 s
341 s
682 s
1.36 ms
2.73 ms
5.46 ms
f
X
= 12 MHz
CHAPTER 10 WATCH TIMER
User’s Manual U14046EJ5V0UD
X
X
/2
/2
Note
7
7
or f
or f
XT
XT
When Operated at
244 s
488 s
977 s
1.95 ms
3.91 ms
7.82 ms
)
)
f
X
= 8.38 MHz
When Operated at
488 s
977 s
1.95 ms
3.91 ms
7.82 ms
15.6 ms
f
X
= 4.19 MHz
14
/f
W
seconds) by using the
488 s
976 s
1.95 ms
3.90 ms
7.81 ms
15.6 ms
When Operated at
f
XT
= 32.768 kHz
243