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RX − 8564 LC
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ETM12E-01
13. Description of Functions
13.1. Description of registers
13.1.1. Control register 1 ( Reg − 00 [h] )
Address [h] Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
00 Control 1 TEST 0 STOP 0 TEST 0 0 0
• This register is used to control stopping and starting of the clock function, calendar function, and other functions.
1) TEST bits (bit 7 and bit 3)
These two TEST bits are for use by Seiko Epson Corporation.
When initializing, be sure to write "0". Afterward, be sure to write "0" whenever writing to these bits.
∗ This device's operations are not guaranteed if "1" has been set to any of these bits.
2) STOP bit
The STOP bit is used to stop functions such as the clock, calendar, alarm, and timer.
Writing "1" to the STOP bit stops operation of the clock, calendar, alarm, timer, etc.
∗1) When the STOP bit = "1", operations are restricted.
Do not use any settings other than the clock and calendar settings.
∗2) When the STOP bit = "1", output via CLKOUT may be stopped, depending on the selected frequency.
Note this with caution.
(1) If 32.768 kHz has been selected as the output frequency, output will continue at 32.768 kHz.
(2) If any other output frequency was selected (1024 Hz, 32 Hz, or 1 Hz), CLKOUT output is stopped.
∗3) When the STOP bit = "1", the I
2
C-BUS bus timeout function is disabled. Note this with caution.
When the STOP bit = "0", these operations are resumed (stop mode is canceled).
∗ 0.5 seconds after the STOP bit value is changed from "1" to "0", the "second" value is updated
(without waiting for a full second to elapse). This operation occurs once only after changing the STOP bit
value.
(This is done to keep the error margin to within ±0.5 seconds in relation to the actual time whenever the
clock value is changed via any timing.)