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FM3565 датащи(PDF) 4 Page - Fairchild Semiconductor

номер детали FM3565
подробное описание детали  CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FM3565 датащи(HTML) 4 Page - Fairchild Semiconductor

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FM3565 Rev. A.1
Reading from the Registers
Data can be read from both of the internal registers. All reads are
non-destructive and do not change the value in the register or the
internal state of the device. When a start condition is received with
a read request, both registers can be read out in the following
sequence:
(1)
SOPRA: Serial Output Port Register A
(2)
SPORB: Serial Output Port Register B
(3)
PIPR: PORT-I Value
If so desired, only the SOPRA register can be read. This is
accomplished by issuing a stop command after the acknowledge
bit for the first byte is read. If no stop is issued, the device will output
the registers in the above sequence.
Writing to the Registers
Data is written to the SOPR registers through the serial port
interface. When a write request is received with the Start Address,
it is assumed that the intent is to write to the SOPR registers. The
value placed in the least 6 significant bits of the register contain the
new code to be placed in the SOPR A/B registers. The value of the
two most significant bits must contain the address of the destina-
tion register SOPRA or SOPRB.
The internal non-volatile latch takes about 10 ms to update its
data.
Register Read Sequence
Slave
SOPRA
SOPRB
PIPR
S Address R A Register A Register A Register A P
S
1001110
1
A 00bbbbbb
A 00bbbbbb
A 00bbbbbb
A
P
Register Write Sequence
Slave
SOPRx
S Address W A Register A S
S
1001110
0
A xxbbbbbb
A
S
xx = Register Selection bits (MXSB and MXSA) xx = 00 selects
SOPRA, 01 selects SOPRB
Register Write Sequence using
Repeated Start Condition
Slave
SOPRA
Slave
SOPRx
S Address R A
Register
A S Address W A
Register
A P
S 1001110 1
A 00bbbbbb A
S 1001110 0
A xxbbbbbb A
P
Figure 4
This protocol uniquely defines START and STOP conditions. A
START condition is defined as a HIGH to LOW transition of the
SDA signal while SCL is HIGH. A STOP condition is defined as a
LOW to HIGH transition of the SDA signal while SCL is HIGH.
These are shown in Figure 2.
Device Addressing
The device uses 7-bit addressing. The address has been defined
as 1001 110 if the ASEL input is ‘1’ and 0110 111 if the ASEL input
is ‘0’. The address byte is the first byte of data sent after a start
condition. This is the only address that this device will respond to.
The device will not respond to the general call address 0000 000.
SDA
SCL
START
Condition
STOP
Condition
OVRD
MUXSEL
A/B
Mux_outputs
0
0
X
all 0's
0
1
X
Mux_inputs
1
0
0
From Non-volatile
register (SOPRB)
1
0
1
From Non-volatile
register (SOPRA)
1
1
X
Mux_inputs
Table 1. Multiplexer Control Options
Multiplexer Logic
The output multiplexer logic determines what value is actually
output to the Y-port. The above table describes all the
combinations.
Serial Interface
The IIC Interface is a standard slave interface. As such, the device
will not generate its own clock. Data can be read from and written
into the device. Commands for reading and writing the registers
are generated by the Master.
START and STOP Conditions


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