UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 244

• 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

10.3 Register to Control Watch Timer
242
• Watch timer operation mode register (WTM)
Note Expanded-specification products of PD780024A, 780034A Subseries only.
Remarks 1. f
The watch timer is controlled by the watch timer operation mode register (WTM).
Caution Do not change the count clock and interval time (by using bits 4 to 7 (WTM4 to WTM7) of WTM)
Address: FF41H
Symbol
WTM
This register sets the watch timer count clock, enables/disables operation, sets the prescaler interval time, and
controls the 5-bit counter operation.
WTM is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears WTM to 00H.
while the watch timer is operating.
2. f
3. f
W
X
XT
WTM7
WTM7
WTM6
WTM1
WTM0
:
: Watch timer clock frequency (f
: Subsystem clock oscillation frequency
Figure 10-2. Format of Watch Timer Operation Mode Register (WTM)
7
0
1
0
0
0
0
1
1
0
1
0
1
Main system clock oscillation frequency
After reset: 00H
Other than above
Operation stopped (both prescaler and timer cleared)
Operation enabled
f
f
Clear after operation stop
Start
X
XT
/2
WTM6
WTM5
(32.768 kHz: f
7
6
0
0
1
1
0
0
(65.4 kHz: f
WTM5
WTM4
R/W
CHAPTER 10 WATCH TIMER
X
5
XT
0
1
0
1
0
1
User’s Manual U14046EJ5V0UD
= 8.38 MHz, 93.7 kHz: f
= 32.768 kHz)
2
2
2
2
2
2
Setting prohibited
Watch timer count clock selection
X
4
5
6
7
8
9
WTM4
/f
/f
/f
/f
/f
/f
/2
5-bit counter operation control
W
W
W
W
W
W
4
7
Watch timer operation enable
or f
XT
)
X
Prescaler interval time selection
3
0
= 12 MHz
Note
2
0
)
WTM1
<1>
WTM0
<0>