RTC4573 查看數據表（PDF） - Seiko Epson Corp

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RTC4573

Serial RTC with Alarm and Timer

Seiko Epson Corp 

n Usage

Functional Overview

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.

[ Writes ]

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

the address to be written in the next four bits.

2) The 8 bits of write data that follow are written to the address that was set; the address is then automatically

incremented, and the next 8 bits of data are written to the new address.

3) The automatic address incrementation is cyclic, with address 0 following address F.

CE

CLK

---

DATA D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7

---

Write mode

Write to address (N)

CODE=3 (0011)

Write DATA to (N)

Write DATA

(to address N + 1)

[ Reads ]

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

address to be written in the next four bits.

2) The 8 bits of data that follow are read from the address that was set; the address is then automatically

incremented, and the next 8 bits of data are read from the new address.

3) The automatic address incrementation is cyclic, with address 0 following address F.

CE

CLK

----

DATA D0 D1 D2 D3 D0

D2

D0

D2

D4

D6

D0

D2

D4

D6

---

Set readout mode READ address (N)

CODE=C (1100)

READ DATA

(address N)

READ DATA

( address N + 1)

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.

Page-8

Aug.1998

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