SS1621 datasheet(10/15 Pages) ETC2

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SS1621

p. 10

Last update: 2008-06-03 04:36

timer/WDT setting command, and an operat-

ing command. The data mode, on the other

hand,

includes

READ,

WRITE,

and

READ-MODIFY-WRITE operations. The

following are the data mode Ids and the com-

mand mode ID:

Operation

Mode

READ

Data

1 1 0

WRITE

Data

1 0 1

READ-MODIFY-WRITE

Data

1 0 1

COMMAND

Command

1 0 0

The mode command should be issued

before the data or command is transferred. If

successive commands have been issued, the

command mode ID, namely 100, can be

omitted. While the system is operating in the

non-successive

command

the

non-successive address data mode, the CS

pin should be set to “1” and the previous op-

eration mode will be reset also. Once the CS

pin returns to “0” a new operation mode ID

should be issued first.

Interfacing

Only four lines are required to interface

with the SS1621. The CS line is used to ini-

tialize the serial interface circuit and to ter-

minate the communication between the host

controller and the SS1621. If the CS pin is

set to 1, the data and command issued be-

tween the host controller and the SS1621 are

first disabled and then initialized. Before is-

suing a mode command or mode switching, a

high level pulse is required to initialize the

serial interface of the SS1621. The DATA

line is the serial data input/output line. Data to

be read or written or commands to be written

have to be passed through the DATA line.

The RD line is the READ clock input. Data

in the RAM are clocked out on the falling

edge of the RD signal, and the clocked out

data will then appear on the DATA line. It is

recommended that the host controller read in

correct data during the interval between the

rising edge and the next falling edge of the

signal. The WR line is the WRITE clock

input. The data, address, and command on the

DATA line are all clocked into the SS1621 on

the rising edge of the WR signal. There is an

optional IRQ line to be used as an interface

between the host controller and the SS1621.

The IRQ pin can be selected as a timer output

or a WDT overflow flag output by the S/W

setting. The host controller can perform the

time base or the WDT function by being con-

nected with the IRQ pin of the SS1621.

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