Rainbow Electronics AT73C246 - Manual (Page 41)

41
11050A–PMAAC–07-Apr-10
AT73C246
11.10.1 RTC Register Read/Write Operation
Figure 11-11. RTC Read Operation
Figure 11-12. RTC Write Operation
RTC_EN
RTC_SEL
RTC_WRITE
RTC_DATA
RTC_ADDR
WRITE
RTC_ADDR
READ
RTC_DATA3
READ
RTC_DATA2
READ
RTC_DATA1
READ
RTC_DATA0
WRITE 02
@RTC_CTRL
WRITE 03
@RTC_CTRL
WRITE 02
@RTC_CTRL
WRITE 00
@RTC_CTRL
RTC_EN = 0
RTC_SEL = 1
RTC_WRITE = 0
RTC_EN = 1
RTC_SEL = 1
RTC_WRITE = 0
RTC_EN = 0
RTC_SEL = 1
RTC_WRITE = 0
RTC_EN = 0
RTC_SEL = 0
RTC_WRITE = 0
TWI ACCESS
RTC_EN
RTC_SEL
RTC_WRITE
RTC_DATA
RTC_ADDR
WRITE
RTC_ADDR
WRITE
RTC_DATA3
WRITE
RTC_DATA2
WRITE
RTC_DATA1
WRITE
RTC_DATA0
WRITE 06
@RTC_CTRL
WRITE 07
@RTC_CTRL
WRITE 06
@RTC_CTRL
WRITE 00
@RTC_CTRL
RTC_EN = 0
RTC_SEL = 1
RTC_WRITE = 1
RTC_EN = 1
RTC_SEL = 1
RTC_WRITE = 1
RTC_EN = 0
RTC_SEL = 1
RTC_WRITE = 1
RTC_EN = 0
RTC_SEL = 0
RTC_WRITE = 0
TWI ACCESS