HD6417751 Datasheet, PDF (305/1105 Pages) Renesas Technology Corp – SuperH RISC engine

11.1.3 Pin Configuration
Table 11.1 shows the RTC pins.
Table 11.1 RTC Pins
Pin Name
Abbreviation I/O
Function
RTC oscillator crystal pin EXTAL2
Input
Connects crystal to RTC oscillator
RTC oscillator crystal pin XTAL2
Output Connects crystal to RTC oscillator
Clock input/clock output TCLK
I/O
External clock input pin/input capture
control input pin/RTC output pin
(shared with TMU)
Dedicated RTC power
V_DD (RTC)
—
supply
RTC oscillator power supply pin*
Dedicated RTC GND pin V_SS (RTC)
—
RTC oscillator GND pin*
Note: * Power must be supplied to the RTC power supply pins even when the RTC is not used.
11.1.4 Register Configuration
Table 11.2 summarizes the RTC registers.
Table 11.2 RTC Registers
Name
64 Hz
counter
Second
counter
Minute
counter
Hour
counter
Day-of-
week
counter
Day
counter
Initialization
Power-
Abbrevia-
On
Manual Standby Initial
tion
R/W Reset Reset Mode Value
R64CNT R Counts Counts Counts Undefined
RSECCNT R/W Counts Counts Counts Undefined
RMINCNT R/W Counts Counts Counts Undefined
RHRCNT R/W Counts Counts Counts Undefined
RWKCNT R/W Counts Counts Counts Undefined
RDAYCNT R/W Counts Counts Counts Undefined
Area 7
P4 Address Address
Access
Size
H'FFC80000 H'1FC80000 8
H'FFC80004 H'1FC80004 8
H'FFC80008 H'1FC80008 8
H'FFC8000C H'1FC8000C 8
H'FFC80010 H'1FC80010 8
H'FFC80014 H'1FC80014 8
Rev. 3.0, 04/02, page 265 of 1064