DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 403

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

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
• 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)
Features
oscillator
32-kHz
circuit
Legend:
RTCCSR:
RSECDR:
RMINDR:
RHRDR:
RWKDR:
RTCCR1:
RTCCR2:
PSS:
Section 11 Realtime Clock (RTC)
TMOW
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
1/4
Figure 11.1 Block Diagram of RTC
PSS
control circuit
Clock count
control circuit
RSECDR
RTCCSR
RMINDR
RTCCR1
RTCCR2
Interrupt
RWKDR
RHRDR
Rev.7.00 Dec. 24, 2008 Page 349 of 698
Interrupt IRQ5
REJ09B0074-0700