rtc-4553ac Epson Electronics America, Inc., rtc-4553ac Datasheet - Page 21

• Manufacturer Part Number: rtc-4553ac
• Description: Real Time Clock Module
• Manufacturer: Epson Electronics America, Inc.

RTC – 4553AC
8.3.12. Timing Charts
(1) Data readout example
(2) Continuous data readout example
Additional information
· When CS0 is "L", the serial address data input at S
· When the SCK clock is less than 8 pulses, the module enters the command standby mode.
S
S
S
S
S
S
Next, when WR = "H" is taken in on the 8th pulse leading edge of SCK , the counter control register
or RAM address is selected, and the data from the selected counter control register or RAM address
are output from S
When the SCK clock is more than 8 pulses, the command is not input correctly.
The internal SCK clock counter is cleared at the leading edge of CS0 .
SCK
CSo
SCK
CSo
WR
WR
S
S
IN
OUT
IN
OUT
When specifying the next data read access, the previously accessed address and data appear at S
Same applies for reading from SRAM.
OUT
When specifying the next data read access, the previously accessed address and data appear at S
OUT
IN
IN
: Input at leading edge of SCK
: Output at trailing edge of SCK
: Input at leading edge of SCK
: Output at trailing edge of SCK
Don't care
Don't care
: Undefined
Undefined
1-second digit address
OUT
A0
A*
Previously accessed address
Address
Address
Access 1 (1-second digit)
Previously accessed address and data
in sync with the trailing edge of SCK .
(0000)
A1
A*
A2
A*
and data
A3
A*
Don't care
Data
D*
Page - 18
D*
Don't care
D*
Address
Address
Access 2 (10-second digit)
1-second digit contents
D*
A0
a0
address (0000)
IN
1-second digit
Don't care
A1
a1
are read at the leading edge of SCK .
Data
(10-second digit) (0001)
a2
A2
Next address
a3
A3
D0 D1 D2 D3
1-second digit data
Address
Address
10-second digit contents
Access 3 (1-minute digit)
Don't care
Don't care
OUT
Data
.
OUT
MQ - 342 - 01
.