Datasheet

DS2408
13 of 39
Figure 8-1. CONTROL FUNCTIONS FLOW CHART
Bus Master TX
TA1 (T7:T0), TA2 (T15:T8)
Y
N
F0h
Read PIO Reg.?
Y
N
Address
< 90h?
To Figure 8
2
nd
Part
From Figure 8
2
nd
Part
Bus Master TX Control
Function Command
To ROM Functions
Flow Chart (Figure 12)
From ROM Functions
Flow Chart (Figure 12)
DS2408 sets Register
Address = (T15:T0)
Bus Master RX Data Byte
from Register Address
Bus Master RX CRC16
of Command, Address,
Data Bytes
Bus Master
RX “1”s
Y
N
DS2408 Incre-
ments Address
Counter
Y
Y
N
N
Master
TX Reset?
Address
< 90h?
Master
TX Reset?
Master
TX Reset?
Y
N
Note:
To read the three PIO state and latch
register bytes, the target address should
be 0088h. Returned data for a target
address <0088h is undefined.
Address
= 88h?
Y
N
DS2408 Samples
PIO Pin Status
1)
Note 1)
See the command
description for the
exact timing of the
PIO pin sampling.