33793 查看數據表（PDF） - Motorola => Freescale
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33793 Datasheet PDF : 24 Pages
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Freescale Semiconductor, Inc.
I/O Control Command
This register controls the I/O ports. When the “DR” bits are
set, the corresponding I/O is enabled as an output. The “L” bit
settings control the level of the corresponding I/O if it is enabled
as an output. The format of this command is shown in Table 11.
Table 11. I/O Control Command Format
Data
Address
Command
CRC
L3 L2 L1 L0 DR3 DR2 DR1 DR0 A3 A2 A1 A0 0 0 1 1 X3 X2 X1 X0
Legend
A[3:0] = Address bits.
DR[3:0] = I/O direction bits. 1 = Output. All bits are set to “0”
by reset/clear.
L[3:0] = Level to output on I/O if configured as output. All bits are set
to “0” by reset/clear
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated
by the master.
I/O Control Response
The response indicates which I/O has been configured as
outputs and their current values.
The values returned will be the values programmed. The
values at the pins will not be the ones that were programmed if
the pin has been forced to the opposite state. The response
format is shown in Table 12. No response is generated if the
command address field was $0.
Table 12. I/O Control Response Format
High Byte
Low Byte
CRC
A3 A2 A1 A0 0 0 0 0 L3 L2 L1 L0 DR3 DR2 DR1 DR0 X3 X2 X1 X0
Legend
A[3:0] = Address bits.
DR[3:0] = I/O enabled as outputs (1 = enabled as output).
L[3:0] = Programmed values.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by
the slave.
Request ID Command
This command will cause the device ID information to be
read from internal storage and returned to the master during the
response to the next message. The command format is found
in Table 13.
Table 13. Request ID Command Format
Data
Address
Command
CRC
–––– –
–
–
– A3 A2 A1 A0 0 1 0 0 X3 X2 X1 X0
Legend
A[3:0] = Address bits. The address of the selected device.
An address value of “0000” is ignored by all devices.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated
by the master.
MOTOROLA ANALOG INTEGRATED CIRFCoUrITMDEoVrIeCEIDnAfoTArmation On This Product,
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