MC68181 Datasheet, PDF (79/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

Freescale Semiconductor, Inc.
MC68181
Host-to-Decoder Packet Descriptions
FORCE RECEIVER SETTING (FRS)
Setting a bit to one will cause the corresponding CLS bit in this packet to override the
internal receiver control settings on the corresponding receiver control line (S0–S7).
Clearing a bit gives control of the corresponding receiver control lines (S0–S7) back to
the FLEX chip IC. The value after reset = 0.
CONTROL LINE SETTING (CLS)
If the corresponding FRS bit was set in this packet, these bits define what setting
should be applied to the corresponding receiver control lines. The value after
reset = 0.
Receiver Control Configuration Packets
These packets allow the host to configure:
• what setting is applied to the receiver control lines S0–S7,
• how long to apply the setting, and,
• when to read the value of the LOBAT input pin.
For a more detailed description of how the FLEX chip IC uses these settings see
Receiver Control Configuration Packets on page B-19.
The FLEX chip IC defines twelve different receiver control settings. Proper operation
is not guaranteed if these settings are changed when decoding is enabled (i.e., the ON
bit in the Control Packet is set). The IDs for these packets range from 16 to 27
(decimal).
Table B-14 Receiver Off Setting Packet Bit Assignments
Byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
3
0
0
0
1
0
0
0
0
2
0
0
0
0
LBC
0
0
0
1
CLS₇
CLS₆
CLS₅
CLS₄
CLS₃
CLS₂
CLS₁
CLS₀
0
ST₇
ST₆
ST₅
ST₄
ST₃
ST₂
ST₁
ST₀
LOW BATTERY CHECK (LBC)
If this bit is set, the FLEX chip IC will check the status of the LOBAT port just before
leaving this receiver state. The value after reset = 0.
MOTOROLA
MC68181 Technical Data Sheet
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B-19