Pin Configuration; Register Configuration; Table 11.1 Rtc Pins; Table 11.2 Rtc Registers - Hitachi SH7751 Hardware Manual

11.1.3

Pin Configuration

Table 11.1 shows the RTC pins.

Table 11.1 RTC Pins

Pin Name
RTC oscillator crystal pin
RTC oscillator crystal pin
Clock input/clock output
Dedicated RTC power
supply
Dedicated RTC 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

Abbrevia-
Name tion
64 Hz R64CNT
counter
Second RSECCNT R/W
counter
Minute RMINCNT
counter
Hour RHRCNT
counter
Day-of- RWKCNT
week
counter
Day RDAYCNT R/W
counter
Abbreviation
EXTAL2
XTAL2
TCLK
V (RTC)
DD
V (RTC)
SS
Initialization
Power-
On Manual
R/W Reset Reset
Counts Counts Counts
R
Counts Counts Counts
Counts Counts Counts
R/W
Counts Counts Counts
R/W
Counts Counts Counts
R/W
Counts Counts Counts
I/O Function
Input Connects crystal to RTC oscillator
Output Connects crystal to RTC oscillator
I/O External clock input pin/input capture
control input pin/RTC output pin
(shared with TMU)
— RTC oscillator power supply pin*
— RTC oscillator GND pin*
Standby Initial
Mode Value P4 Address
Undefined H'FFC80000 H'1FC80000 8
Undefined H'FFC80004 H'1FC80004 8
Undefined H'FFC80008 H'1FC80008 8
Undefined H'FFC8000C H'1FC8000C 8
Undefined H'FFC80010 H'1FC80010 8
Undefined H'FFC80014 H'1FC80014 8
Rev. 3.0, 04/02, page 265 of 1064
Area 7 Access
Address Size