SH7727 Datasheet, PDF (530/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 16 Realtime Clock (RTC)
16.1.2 Block Diagram
Figure 16.1 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 the week counter
RDAYCNT: Date counter
RMONCNT: Month counter
RYRCNT: Year counter
RTC
RSECAR: Second alarm register
RHRAR: Minute alarm register
RMINAR: Hour alarm register
RWKAR: Day of the week alarm register
RDAYAR: Date alarm register
RMONAR: Month alarm register
RCR1: RTC control register 1
RCR2: RTC control register 2
Figure 16.1 RTC Block Diagram
Rev. 5.00 Dec 12, 2005 page 458 of 1034
REJ09B0254-0500