UPD78F0411GA-GAM-AX Datasheet, PDF (266/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
9.3 Registers Controlling Real-Time Counter
Timer real-time counter is controlled by the following 16 registers.
(1) Real-time counter clock selection register (RTCCL)
This register controls the mode of real-time counter.
RTCCL can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-2. Format of Real-time Counter Clock Selection Register (RTCCL)
Address: FF54H After reset: 00H R/W
Symbol
7
6
5
4
3
2
<1>
<0>
RTCCL
0
0
0
0
0
0
RTCCL1
RTCCL0
RTCCL1
0
0
1
1
RTCCL0
0
1
0
1
Control of real-time counter (RTC) input clock (fRTC)
fSUB
fPRS/2⁷
fPRS/2⁸
Setting prohibited
Remark • When fPRS = 4.19 MHz, fRTC = fPRS/2⁷ = 32.768 kHz
• When fPRS = 8.38 MHz, fRTC = fPRS/2⁸ = 32.768 kHz
(2) Real-time counter control register 0 (RTCC0)
The RTCC0 register is an 8-bit register that is used to start or stop the real-time counter operation, control the
RTCCL and RTC1HZ pins, and set a 12- or 24-hour system and the constant-period interrupt function.
RTCC0 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
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User’s Manual U18698EJ1V0UD