MC145574AAER2 Freescale Semiconductor, MC145574AAER2 Datasheet - Page 56

• Manufacturer Part Number: MC145574AAER2
• Manufacturer: Freescale Semiconductor

Specifications of MC145574AAER2

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

6–10
6.8.1
6.8.2
6.8.3
Monitor Channel Commands
A GCI device transmits Monitor channel commands to a receiving MC145574 to access its internal
register set. The receiving MC145574 then transmits a Monitor channel response message onto the
Monitor channel for commands that request data to be read from an internal register. Commands
that write data to an internal MC145574 register are accepted and acted upon, but the MC145574
does not issue a response message. The Monitor channel commands are given in Table 6–5.
The MC145574 acknowledges all messages it receives over the Monitor channel. If an invalid message
is received, the MC145574 acknowledges it but does not take any action.
Monitor Channel Response Messages
The Monitor channel response messages are transmitted onto the GCI Monitor channel by the
MC145574 in response to a register read command. The Monitor channel response messages are
given in Table 6–6.
Monitor Channel Status Indication Messages
This message is automatically transmitted onto the GCI Monitor channel by the MC145574 when a
status change has occurred within the device. This message is analogous to the interrupt in SCP
mode. The Monitor channel status indication message is given in Table 6–7.
The status indication message is in effect a read of the interrupt status register NR3. By default, this
indication message is disabled. The indication message must be first enabled by writing to the Monitor
channel register NR4.
7
0
0
0
0
1
7
0
0
0
7
0
MSB
MSB
MSB
6
0
0
0
0
0
6
0
0
1
6
0
5
0
0
1
1
0
5
0
1
0
5
1
4
0
1
0
1
0
4
1
1
0
4
1
Byte 1
Byte 1
Byte 1
Freescale Semiconductor, Inc.
Table 6–7. Monitor Channel Status Indication Messages
ba3
ba3
ba3
3
0
0
0
3
0
0
3
0
For More Information On This Product,
Table 6–6. Monitor Channel Response Messages
ba2
ba2
na2
na2
ba2
na2
2
0
2
0
2
0
Table 6–5. Monitor Channel Commands
Go to: www.freescale.com
ba1
ba1
na1
na1
ba1
na1
1
0
1
0
1
1
MC145574
LSB
LSB
LSB
ba0
ba0
na0
na0
ba0
na0
0
0
0
0
0
1
d7
d3
d7
d3
d3
X
X
X
7
7
x
7
MSB
MSB
MSB
d6
d2
d6
d2
d2
X
X
X
6
6
x
6
d5
d1
d5
d1
d1
X
X
X
5
5
x
5
d4
d0
d4
d0
d0
X
X
X
4
4
x
4
Byte 2
Byte 2
Byte 2
d3
d3
3
X
X
X
X
3
3
x
x
x
d2
d2
2
X
X
X
X
2
2
x
x
x
d1
d1
X
X
X
X
1
1
x
x
1
x
LSB
LSB
LSB
d0
d0
X
X
X
X
0
0
x
x
0
x
MOTOROLA
ID Command
ID Response
Nibble Read
Nibble Read
Nibble Write
Byte Read
Byte Read
NR3 Read
Comment
Byte Write
Comment
Comment