SH7751 Datasheet, PDF (391/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

11. Realtime Clock (RTC)
11.1.3 Pin Configuration
Table 11.1 shows the RTC pins.
Table 11.1 RTC Pins
Pin Name
Abbreviation I/O
Function
RTC oscillation circuit
crystal pin
EXTAL2
Input Connects crystal to RTC oscillation circuit
RTC oscillation circuit
crystal pin
XTAL2
Output Connects crystal to RTC oscillation circuit
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
supply
V
DD-RTC
—
RTC oscillation circuit power supply pin*
Dedicated RTC GND pin V_SS-RTC
—
RTC oscillation circuit 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.4.00 Oct. 10, 2008 Page 293 of 1122
REJ09B0370-0400