HD6417705F133V Datasheet, PDF (401/741 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

15.2 Input/Output Pins
Table 15.1 shows the RTC pin configuration.
Table 15.1 Pin Configuration
Pin
Abbreviation I/O Function
Crystal oscillator for RTC
EXTAL2
I Connects crystal to RTC oscillator^*
Crystal oscillator for RTC
XTAL2
O Connects crystal to RTC oscillator^*
Power-supply for RTC
VCC-RTC
— Power-supply pin for RTC
GND for RTC
VSS-RTC
— GND pin for RTC
Note: * Pull up (VccQ (3.3 V power)) EXTAL2 and leave XTAL2 open, when the RTC is not used.
15.3 Register Descriptions
The RTC has the following registers. Refer to section 24, List of Registers, for more detail of the
address and access size.
• 64-Hz counter (R64CNT)
• Second counter (RSECCNT)
• Minute counter (RMINCNT)
• Hour counter (RHRCNT)
• Day of week counter (RWKCNT)
• Date counter (RDAYCNT)
• Month counter (RMONCNT)
• Year counter (RYRCNT)
• Second alarm register (RSECAR)
• Minute alarm register (RMINAR)
• Hour alarm register (RHRAR)
• Day of week alarm register (RWKAR)
• Date alarm register (RDAYAR)
• Month alarm register (RMONAR)
• Year alarm register (RYRAR)
• RTC control register 1 (RCR1)
• RTC control register 2 (RCR2)
• RTC control register 3 (RCR3)
Rev. 2.00, 09/03, page 353 of 690