Renesas SH7709S Manual Do Utilizador

Rev. 5.00, 09/03, page 408 of 760

Figure 13.1 shows a block diagram of the RTC.

Module bus

RTC

Internal bus

Interrupt

control

circuit

Prescaler

(

÷ 

2)

RTCCLK

Bus

interface

Carry

detection

circuit

ATI

PRI

CUI

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

RSECAR: 

Second alarm register

RMINAR: 

Minute alarm register

RHRAR: 

Hour alarm register

RWKAR: 

Day-of-week alarm register

RDAYAR: 

Day alarm register

RMONAR: 

Month alarm register

RCR1: 

RTC control register 1

RCR2: 

RTC control register 2

R64CNT

Reset

RSECCNT

RMINCNT

RHRCNT

RWKCNT

16.384 kHz

RDAYCNT

RMONCNT

RYRCNT

Comparator

RSECAR

RMINAR

RHRAR

RWKAR

RDAYAR

RCR1

RCR2

30-

second

ADJ

EXTAL2

32.768 kHz

128 Hz

XTAL2

Externally

connected

circuit

Oscillator

circuit

Prescaler

(

÷ 

128)

RMONAR