SH7706 Datasheet, PDF (389/749 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7700 Series

Section 13 Realtime Clock (RTC)
13.2 Input/Output Pin
Table 13.1 shows the RTC pin configuration.
Table 13.1 RTC Pin Configuration
Pin
Abbreviation I/O Description
RTC oscillator crystal pin
RTC oscillator crystal pin
EXTAL2
XTAL2
I
Connects crystal to RTC oscillator^*2
O
Connects crystal to RTC oscillator^*2
Clock input/clock output
TCLK
I/O External clock input pin/input capture
control input pin/realtime clock (RTC)
output pin (shared by TMU)
Dedicated power-supply pin
for RTC
V_CC-RTC
—
Dedicated power-supply pin for RTC^*1
Dedicated GND pin for RTC V -RTC
SS
—
Dedicated GND pin for RTC^*1
Notes: 1. Except for in hardware standby mode, even if only the RTC is used (software standby
mode), power must be supplied to all power supply pins, including these RTC power
supply pins. In hardware standby mode, it is possible to stop supplying power to the
power supply pins except for the RTC power supply pins.
2. Pull-up (Vcc) EXTAL2, and open (NC) XTAL2 when the RTC is not used.
13.3 Register Description
RTC has the registers listed below. Refer to section 23, List ot 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)
Rev. 5.00 May 29, 2006 page 341 of 698
REJ09B0146-0500