SH7709S Datasheet, PDF (452/807 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

13.1.2 Block Diagram
Figure 13.1 shows a block diagram of the RTC.
Externally
connected
circuit
EXTAL2
XTAL2
RTCCLK
Oscillator
circuit
32.768 kHz
Prescaler
(÷ 2)
16.384 kHz
Prescaler
(÷ 128)
30-
second
Reset ADJ
128 Hz
R64CNT
RSECCNT
RMINCNT
RHRCNT
RWKCNT
RDAYCNT
RMONCNT
RYRCNT
Bus
interface
ATI
Interrupt
control
PRI
circuit
Carry
CUI
detection
circuit
Comparator
RSECAR
RMINAR
RHRAR
RWKAR
RDAYAR
RMONAR
RCR1
RCR2
Legend
R64CNT: 64 Hz counter
RSECCNT: Second counter
RMINCNT: Minute counter
RHRCNT: Hour counter
RWKCNT: Day-of-week counter
RDAYCNT: Day counter
RMONCNT: Month counter
RYRCNT: Year counter
RTC
RSECAR:
RMINAR:
RHRAR:
RWKAR:
RDAYAR:
RMONAR:
RCR1:
RCR2:
Second alarm register
Minute alarm register
Hour alarm register
Day-of-week alarm register
Day alarm register
Month alarm register
RTC control register 1
RTC control register 2
Figure 13.1 Block Diagram of RTC
Rev. 5.00, 09/03, page 408 of 760