UPD78F1502AGK-GAK-AX Datasheet, PDF (847/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 26 OPTION BYTE
Figure 26-1. Format of User Option Byte (000C0H/010C0H) (2/2)
Address: 000C0H/010C0H^{Note 1}
7
6
WDTINIT WINDOW1
5
WINDOW0
4
WDTON
3
WDCS2
2
WDCS1
1
WDCS0
0
WDSTBYON
WDSTBYON
Operation control of watchdog timer counter (HALT/STOP mode)
0
Counter operation stopped in HALT/STOP mode^{Note 2}
1
Counter operation enabled in HALT/STOP mode
Notes 1.
2.
Set the same value as 000C0H to 010C0H when the boot swap operation is used because 000C0H is
replaced by 010C0H.
The window open period is 100% when WDSTBYON = 0, regardless the value of WINDOW1 and
WINDOW0.
Caution The watchdog timer continues its operation during self-programming of the flash memory and
EEPROM emulation. During processing, the interrupt acknowledge time is delayed. Set the overflow
time and window size taking this delay into consideration.
Remark fIL: Internal low-speed oscillation clock frequency
Figure 26-2. Format of User Option Byte (000C1H/010C1H)
Address: 000C1H/010C1H^{Note 1}
7
6
5
4
3
2
1
1
1
1
1
1
FRQSEL2 FRQSEL1
0
LVIOFF
FRQSEL2 FRQSEL1
0
1
1
0
1
1
Other than the above
8 MHz/20 MHz ^{Note 2}
1 MHz ^{Note 3}
8 MHz
Setting prohibited
Internal high-speed oscillator frequency
LVIOFF
0
1
Setting of LVI on power application
LVI is ON by default (LVI default start function enabled) upon reset release (upon power
application)
LVI is OFF by default (LVI default start function stopped) upon reset release (upon power
application)
Notes 1.
2.
3.
Set the same value as 000C1H to 010C1H when the boot swap operation is used because 000C1H is
replaced by 010C1H.
When 8 MHz or 20 MHz has been selected, the 8 MHz internal high-speed oscillator automatically starts
oscillating after reset release. To use the 20 MHz internal high-speed oscillator to operate the
microcontroller, oscillation is started by setting bit 0 (DSCON) of the 20 MHz internal high-speed oscillation
control register (DSCCTL) to 1 with VDD ≥ 2.7 V. The circuit cannot be changed to a 1 MHz internal high-
speed oscillator while the microcontroller operates.
When 1 MHz has been selected, the microcontroller operates on the 1 MHz internal high-speed oscillator
after reset release. The circuit cannot be changed to an 8 MHz or 20 MHz internal high-speed oscillator
while the microcontroller operates.
(Cautions are listed on the next page.)
R01UH0004EJ0501 Rev.5.01
831
Jun 20, 2011