UPD78F9222CS-CAC-A Renesas Electronics America, UPD78F9222CS-CAC-A Datasheet - Page 155
UPD78F9222CS-CAC-A
Manufacturer Part Number
UPD78F9222CS-CAC-A
Description
MCU 8BIT 4KB FLASH 20PIN
Manufacturer
Renesas Electronics America
Series
78K0S/Kx1+r
Datasheet
1.UPD78F9221MC-5A4-A.pdf
(418 pages)
Specifications of UPD78F9222CS-CAC-A
Core Processor
78K0S
Core Size
8-Bit
Speed
10MHz
Connectivity
LIN, UART/USART
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
15
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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9.3
(1) Watchdog timer mode register (WDTM)
Address: FF48H
The watchdog timer is controlled by the following two registers.
Symbol
WDTM
This register sets the overflow time and operation clock of the watchdog timer.
This register can be set by an 8-bit memory manipulation instruction and can be read many times, but can be
written only once after reset is released.
Reset signal generation sets this register to 67H.
Watchdog timer mode register (WDTM)
Watchdog timer enable register (WDTE)
Registers Controlling Watchdog Timer
Notes 1.
WDCS4
WDCS2
7
0
0
0
1
0
0
0
0
1
1
1
1
2.
Note 1
Note 2
After reset: 67H
WDCS3
WDCS1
If “low-speed internal oscillator cannot be stopped” is specified by the option byte, this cannot
be set. The low-speed internal oscillation clock will be selected no matter what value is
written.
Reset is released at the maximum cycle (WDCS2, 1, 0 = 1, 1, 1).
Figure 9-2. Format of Watchdog Timer Mode Register (WDTM)
1
0
0
0
1
1
0
0
1
1
6
1
Note 1
Note 2
WDCS0
Low-speed internal oscillation clock (f
System Clock (f
Watchdog timer operation stopped
R/W
0
1
0
1
0
1
0
1
5
1
CHAPTER 9 WATCHDOG TIMER
Note 2
User’s Manual U16898EJ6V0UD
2
2
2
2
2
2
2
2
11
12
13
14
15
16
17
18
WDCS4
oscillation clock operation
During low-speed internal
/f
/f
/f
/f
/f
/f
/f
/f
X
RL
RL
RL
RL
RL
RL
RL
RL
)
4
(4.27 ms)
(8.53 ms)
(17.07 ms)
(34.13 ms)
(68.27 ms)
(136.53 ms)
(273.07 ms)
(546.13 ms)
Operation clock selection
WDCS3
3
Overflow time setting
RL
)
WDCS2
2
2
2
2
2
2
2
2
2
During system clock operation
13
14
15
16
17
18
19
20
/f
/f
/f
/f
/f
/f
/f
/f
X
X
X
X
X
X
X
X
(819.2 s)
(1.64 ms)
(3.28 ms)
(6.55 ms)
(13.11 ms)
(26.21 ms)
(52.43 ms)
(104.86 ms)
WDCS1
1
WDCS0
0
153
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