參數(shù)資料
型號: 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): 26/50頁
文件大?。?/td> 6613K
代理商: MC68QH302
MOTOROLA
MC68QH302 Supplement to the MC68302 Users Manual
17
2.6.4 BTMODEB-Channel Transmit Mode
The B-channel transmit mode byte is valid when operating in QH mode only and contains
B-channel mode bits. Figure 9 and Table 17 describe the bit Telds.
Figure 9. BTMODE Byte
2.6.5 BNOFB-Channel Number of Flags
The B-channel number-of-ags byte speciTes the number of ags to be sent between
frames on the B channels. Figure 10 and Table 18 show the bit Telds for initialization.
Figure 10. BNOF Byte
7
6
5
4
3
2
1
0
FLG
TIDL
PAGE
MSNUM
Table 17. BTMODE Field Descriptions
Bit(s)
Name
Description
7
FLG
Flag mode—send FLAG or IDLE characters between HDLC frames
0 Send IDLEs (‘0xFF’) between frames—must be selected when in transparent mode
1 Send FLAG characters (‘0x7E’) between frames
6
TIDL
Programmed to be the complement of the FLG bit (FLG)
5–4
PAGE
Page selection
00
B1 channel
10
B2 channel
3–0
MSNUM
Serial number should always be programmed to 0b1000.
7
6
5
4
3
2
1
0
00
PAGE
NOF
Table 18. BNOF Field Descriptions
Bit(s)
Name
Description
7–6
For internal use—must be initialized to zero
5–4
PAGE
Page selection
00
B1 channel
10
B2 channel
3–0
NOF
Minimum number of flags between or before frames, 0 to 15.
For transparent mode, NOF must be zero so that the closing flag of one frame will be
followed by the opening flag of the next frame.
In HDLC mode, when NOF = 0, the closing flag of one frame and the opening flag of the
next frame overlap; only one “shared flag” is transmitted between consecutive frames.
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