H8SSLASH2218 datasheet(397/750 Pages) RENESAS

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Section 11 Realtime Clock (RTC)

Rev.6.00 Jun. 03, 2008 Page 349 of 698

REJ09B0074-0600

Section 11 Realtime Clock (RTC)

The realtime clock (RTC) is a timer used to count time ranging from a second to a week. Figure

11.1 shows the block diagram of the RTC.

11.1

Features

• Counts seconds, minutes, hours, and day-of-week

• Start/stop function

• Reset function

• Readable/writable counter of seconds, minutes, hours, and day-of-week with BCD codes

• Periodic (seconds, minutes, hours, days, and weeks) interrupts

• 8-bit free running counter

• Selection of clock source

• 8-bit bus (3 cycle access timing) connected to the external bus

RTC register is allocated to a part of area 7 of external address (H'FFFF48 to H'FFFF4F)

PSS

32-kHz

oscillator

circuit

RTCCSR

RSECDR

RMINDR

RWKDR

Clock count

control circuit

Interrupt

control circuit

Interrupt

IRQ5

RTCCR1

RHRDR

RTCCR2

1/4

TMOW

Legend:

RTCCSR:

RSECDR:

RMINDR:

RHRDR:

RWKDR:

RTCCR1:

RTCCR2:

PSS:

Clock source select register

Second date register

Minute date register

Hour date register

Day-of-week date register

RTC control register 1

RTC control register 2

Prescaler S

Figure 11.1 Block Diagram of RTC

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