UPD78F1009GB-GAH-AX Renesas Electronics America, UPD78F1009GB-GAH-AX Datasheet - Page 548

• Manufacturer Part Number: UPD78F1009GB-GAH-AX
• Description: MCU 16BIT 78K0R/KX3-L 64-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Kx3-Lr

Specifications of UPD78F1009GB-GAH-AX

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0R/Kx3-L
12.4.2 Setting overflow time of watchdog timer
counting again by writing “ACH” to the watchdog timer enable register (WDTE) during the window open period before the
overflow time.
R01UH0106EJ0300 Rev.3.00
Oct 01, 2010
Cautions 4. The operation of the watchdog timer in the HALT and STOP modes differs as follows depending
Set the overflow time of the watchdog timer by using bits 3 to 1 (WDCS2 to WDCS0) of the option byte (000C0H).
If an overflow occurs, an internal reset signal is generated. The present count is cleared and the watchdog timer starts
The following overflow times can be set.
Caution The watchdog timer continues its operation during self-programming of the flash memory and
Remark f
EEPROM emulation. During processing, the interrupt acknowledge time is delayed. Set the overflow
time and window size taking this delay into consideration.
5. The watchdog timer continues its operation during self-programming of the flash memory and
IL
: Internal low-speed oscillation clock frequency
on the set value of bit 0 (WDSTBYON) of the option byte (000C0H).
If WDSTBYON = 0, the watchdog timer resumes counting after the HALT or STOP mode is
released. At this time, the counter is cleared to 0 and counting starts.
When operating with the X1 oscillation clock after releasing the STOP mode, the CPU starts
operating after the oscillation stabilization time has elapsed.
Therefore, if the period between the STOP mode release and the watchdog timer overflow is short,
an overflow occurs during the oscillation stabilization time, causing a reset.
Consequently, set the overflow time in consideration of the oscillation stabilization time when
operating with the X1 oscillation clock and when the watchdog timer is to be cleared after the
STOP mode release by an interval interrupt.
EEPROM
overflow time and window size taking this delay into consideration.
WDCS2
In HALT mode
In STOP mode
0
1
0
0
0
1
1
1
TM
emulation. During processing, the interrupt acknowledge time is delayed. Set the
Table 12-3. Setting of Overflow Time of Watchdog Timer
WDCS1
0
0
1
1
0
0
1
1
Watchdog timer operation stops.
WDCS0
0
1
0
1
0
1
0
1
WDSTBYON = 0
2
2
2
2
2
2
2
2
7
8
9
10
12
14
15
17
/f
/f
/f
/f
/f
/f
/f
/f
IL
IL
IL
IL
IL
IL
IL
IL
(3.71 ms)
(7.42 ms)
(14.84 ms)
(29.68 ms)
(118.72 ms)
(474.90 ms)
(949.80 ms)
(3799.19 ms)
Overflow Time of Watchdog Timer
(f
IL
= 34.5 kHz (MAX.))
Watchdog timer operation continues.
CHAPTER 12 WATCHDOG TIMER
WDSTBYON = 1
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