參數(shù)資料
型號(hào): MC68QH302
廠商: Motorola, Inc.
英文描述: 32-Bit Microprocessor(32位微處理器)
中文描述: 32位微處理器(32位微處理器)
文件頁數(shù): 39/50頁
文件大?。?/td> 6613K
代理商: MC68QH302
30
MC68QH302 Supplement to the MC68302 Users Manual
MOTOROLA
2.13 Channel Host Commands
The host issues commands to the CPM through the command register. The host should set
the FLG bit when sending a command. After executing the command, the CPM clears the
FLG bit to signal command completion. The host should poll the FLG bit before issuing
the next command. A reset clears the command register. Figure 26 shows the Telds of the
command register.
Figure 26. Host Command Register
For non-QH operation and for non-QH or NMSI channels, the QH302s command register
functions the same as in the 302. The RST and GCI commands are also the same. In QH
mode, however, the channel numbers and opcodes are interpreted differently. Table 29
shows the QH-mode interpretation of the opcodes; Table 30 shows the difference in channel
numbers between QH and non-QH modes.
7
6
5
4
3
2
1
0
Base + 0x860
RST
GCI
OPCODE
CH. NUM.
FLG
Table 29. QH Mode Opcodes for the Command Register
Opcode
B Channel Command
D Channel Command
00
STOP
TX
STOP
TX
01
RESTART
TX
RESTART
TX
10
STOP
RX
ENTER
HUNT
MODE
11
RESTART
RX
Reserved
Table 30. Command Register Channel Numbers for QH and Non-QH Modes
Channel Number
Non-QH Mode
QH Mode
00
SCC1
B1 Channel
01
SCC2
SCC2
10
SCC3
D Channel
11
Reserved
B2 Channel
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