S-35770E01A-K8T2U Datasheet, PDF (13/26 Pages) Seiko Instruments Inc – CONVENIENCE TIMER

Rev.1.2_00
FOR AUTOMOTIVE 125°C OPERATION 2-WIRE COUNTER CONVENIENCE TIMER
S-35770 Series
 Configuration of Registers
1. Count register
The count register is a 3-byte register that stores the counter value as binary code.
The count register is read-only.
Perform the read operation of the count register in 3-byte unit from CNT23 to CNT0.
Example:
3
45
19,800
(0000_0000_0000_0000_0000_0011)
(0000_0000_0000_1010_1000_1100)
(0000_0000_0100_1101_0101_1000)
CNT23 CNT22 CNT21 CNT20 CNT19 CNT18 CNT17 CNT16
B7
B0
CNT15 CNT14 CNT13 CNT12 CNT11 CNT10 CNT9 CNT8
B7
B0
CNT7 CNT6 CNT5 CNT4 CNT3 CNT2 CNT1 CNT0
B7
B0
Figure 17
2. Free register
The free register is a 3-byte register that can be freely read and written by the user. The lower 3 bits, RST2 to RST0 are
used as a register to input the counter reset command. The counter is reset by writing RST2 = "0", RST1 = "1", and
RST0 = "0". The data of F20 to F0 are not reset when inputting the reset command; however, the data when the reset
command is input are set.
When only the data of F20 to F0 are rewritten without resetting the counter, write the data except for the above
mentioned ones, such as RST2 = "1", RST1 = "1" and RST0 = "1" to the free register.
Perform the write and read operation of the free register in 3-byte unit.
F20
F19
F18
F17
F16
F15
F14
F13
B7
B0
F12 F11 F10
F9
F8
F7
F6
F5
B7
B0
F4
F3
F2
F1
F0
RST2 RST1 RST0
B7
B0
Figure 18
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