Renesas RL78 Series User Manual

RL78/F13, F14 CHAPTER 9 REAL-TIME CLOCK
R01UH0368EJ0210 Rev.2.10 667
Dec 10, 2015
9.3.8 Second count register (SEC)
The SEC register is an 8-bit register that takes a value of 0 to 59 (decimal) and indicates the count value of seconds.
It counts up when the internal counter (16 bits) overflows.
When data is written to this register, it is written to a buffer and then to the counter up to 2 operating clocks (f
RTC) later.
Set a decimal value of 00 to 59 to this register in BCD code.
Set the SEC register by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-9. Format of Second Count Register (SEC)
Address: FFF92H After reset: 00H R/W
Symbol 7 6 5 4 3 2 1 0
SEC 0 SEC40 SEC20 SEC10 SEC8 SEC4 SEC2 SEC1
Caution When it reads or writes from/to the register while the counter is in operation (RTCE = 1), see
9.4.3 Reading/writing real-time clock and follow the described procedures.
Remark If writing is performed to the second count register (SEC), the internal counter (16 bits) is cleared.
9.3.9 Minute count register (MIN)
The MIN register is an 8-bit register that takes a value of 0 to 59 (decimal) and indicates the count value of minutes.
It counts up when the second counter overflows.
When data is written to this register, it is written to a buffer and then to the counter up to 2 operating clocks (f
RTC) later.
Even if the second count register overflows while this register is being written, this register ignores the overflow and is set
to the value written. Set a decimal value of 00 to 59 to this register in BCD code.
Set the MIN register by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-10. Format of Minute Count Register (MIN)
Address: FFF93H After reset: 00H R/W
Symbol 7 6 5 4 3 2 1 0
MIN 0 MIN40 MIN20 MIN10 MIN8 MIN4 MIN2 MIN1
Caution When it reads or writes from/to the register while the counter is in operation (RTCE = 1), see
9.4.3 Reading/writing real-time clock and follow the described procedures.

Renesas RL78 Series Specifications

General

Core	RL78
CPU Clock Speed	Up to 32 MHz
Flash Memory	Up to 512 KB
RAM	Up to 32 KB
Operating Voltage	1.6 V to 5.5 V
Low Power Modes	HALT, STOP, SNOOZE
CPU Architecture	16-bit
Temperature Range	-40°C to +85°C
Package	LQFP
Timers	16-bit timers
Communication Interfaces	UART, I2C, LIN
A/D Converter	12-bit