UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 242

• 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

10.1 Watch Timer Functions
(1) Watch timer
(2) Interval timer
240
Remark f
The watch timer has the following functions.
The watch timer and the interval timer can be used simultaneously.
Figure 10-1 shows the watch timer block diagram.
When the main system clock or subsystem clock is used, interrupt requests (INTWT) are generated at 2
second intervals.
Interrupt requests (INTWTI) are generated at the preset time interval.
For the interval time, see Table 10-2.
f
X
/2
f
XT
7
f
f
W
X
XT
: Main system clock oscillation frequency
: Watch timer clock frequency (f
: Subsystem clock oscillation frequency
f
W
f
2
W
4
Figure 10-1. Watch Timer Block Diagram
f
2
W
9-bit prescaler
5
CHAPTER 10 WATCH TIMER
f
2
W
6
Clear
f
2
User’s Manual U14046EJ5V0UD
W
7
Watch timer operation
mode register (WTM)
X
f
2
W
/2
8
WTM7 WTM6 WTM5 WTM4 WTM1 WTM0
7
or f
2
f
W
Internal bus
9
XT
)
5-bit counter
Clear
INTWT
INTWTI
14
/f
W