UPD78F1502AGK-GAK-AX Datasheet, PDF (986/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
Function
Details of
Function
APPENDIX C LIST OF CAUTIONS
Cautions
(14/39)
Page
Real-time
counter
Watchdog
timer
RTCC1: Real- _{If writing is performed to the RTCC1 register with a 1-bit manipulation instruction, the} p.351 _†
time counter
RIFG and WAFG flags may be cleared. Therefore, to perform writing to the RIFG and
control register 1 _{WAFG flags, be sure to use an 8-bit manipulation instruction. At this time, set 1 to the}
RIFG and WAFG flags to invalidate writing and not to clear the RIFG and WAFG flags
during writing. When the value may be rewritten because the RIFG and WAFG flags
are not being used, the RTCC1 register may be written by using a 1-bit manipulation
instruction.
RTCC2: Real- _{Change ICT2, ICT1, and ICT0 when RINTE = 0.}
time counter
When the output from RTCDIV pin is stopped, the output continues after a maximum
control register 2 _{of two clocks of fXT and enters the low level. While 512 Hz is output, and when the}
p.352 _†
p.352 _†
output is stopped immediately after entering the high level, a pulse of at least one
clock width of fSUB may be generated.
After the real-time counter starts operating, the output width of the RTCDIV pin may ^p.352 †
RSUBC: Sub-
be shorter than as set during the first interval period.
When a correction is made by using the SUBCUD register, the value may become
p.353 _†
count register 8000H or more.
This register is also cleared by reset effected by writing the second count register.
p.353 _†
The value read from this register is not guaranteed if it is read during operation,
p.353 _†
because a value that is changing is read.
HOUR: Hour
Bit 5 (HOUR20) of HOUR indicates AM(0)/PM(1) if AMPM = 0 (if the 12-hour system p.354 _†
count register is selected).
WEEK: Week The value corresponding to the month count register or the day count register is not p.356 _†
count register stored in the week count register automatically. After reset release, set the week
count register as follow.
ALARMWM:
Set a decimal value of 00 to 59 to this register in BCD code. If a value outside the p.359 _†
Alarm minute range is set, the alarm is not detected.
register
ALARMWH:
Set a decimal value of 00 to 23, or 01 to 12 and 21 to 32 to this register in BCD code. p.359 _†
Alarm hour
If a value outside the range is set, the alarm is not detected.
register
Bit 5 (WH20) of ALARMWH indicates AM(0)/PM(1) if AMPM = 0 (if the 12-hour
p.359 _†
system is selected).
Reading/writing Complete the series of operations of setting RWAIT to 1 to clearing RWAIT to 0 within pp.364 _†
real-time counter 1 second.
, 365
WDTE:
If a value other than “ACH” is written to WDTE, an internal reset signal is generated. p.376 _†
Watchdog timer If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset
p.376 _†
enable register signal is generated.
The value read from WDTE is 9AH/1AH (this differs from the written value (ACH)). p.376 _†
R01UH0004EJ0501 Rev.5.01
970
Jun 20, 2011