RTC4573 Epson Company, RTC4573 Datasheet - Page 8

• Manufacturer Part Number: RTC4573
• Description: Serial RTC with Alarm and Timer
• Manufacturer: Epson Company

n Usage
Functional Overview
[ Writes ]
CLK
DATA
[ Reads ]
C E
CLK
DATA
C E
The basic sequence for reads and writes is the same: after the CE input goes high, the 4-bit mode is set, the 4-bit
address is specified, and then the data is read or written in 8-bit units.If the input of an 8-bit unit of data is not yet
complete when the CE input is set low, the 8-bit data that was being written when the CE input went low is ignored.
(Prior data is valid. Also, in these circumstances, the WF bit is set to "1", indicating that the write operation was not
completed normally.)Writes and reads are both LSB first.
1) After the CE input goes high, set the value of the first four write bits is to "3", indicating write mode, and then set
2) The 8 bits of write data that follow are written to the address that was set; the address is then automatically
3) The automatic address incrementation is cyclic, with address 0 following address F.
1) After the CE input goes high, set the value of the first four write bits to "C", indicating read mode, and then set the
2) The 8 bits of data that follow are read from the address that was set; the address is then automatically
3) The automatic address incrementation is cyclic, with address 0 following address F.
If the mode setting code was set to a value other than "C" or "3", the subsequent data is ignored and the DATA pin
remains in the input state.
the address to be written in the next four bits.
incremented, and the next 8 bits of data are written to the new address.
address to be written in the next four bits.
incremented, and the next 8 bits of data are read from the new address.
Set readout mode
CODE=C (1100)
Write mode
CODE=3 (0011)
D0
D0 D1 D2
D1
D2 D3
D3 D0
D0 D1
Write to address (N)
READ address (N)
D2 D3
D2
D0
D0
D1
Write DATA to (N)
D2 D3
D2
Page-8
READ DATA
(address N)
D4
D4
D5
D6
D7
D6
D0
D1
D0
D2
Write DATA
(to address N + 1)
D3
D2
READ DATA
( address N + 1)
D4 D5
D4
D6 D7
D6
Aug.1998
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