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): 41/50頁
文件大?。?/td> 6613K
代理商: MC68QH302
32
MC68QH302 Supplement to the MC68302 Users Manual
MOTOROLA
2.14 QH Parameters Initialization Summary
All parameters must be initialized after every software or hardware reset and before
enabling any serial channel, but only some of them should be initialized before every
RESTART
. See Table 33, Table 34, and Table 35 for the initialization of the B channels when
operating in QH mode. Initialization of all other serial channels parameters, boldfaced
parameters in Section 2.7, òNon-QH Channel Parameter RAM,ó should be initialized as in
the 302 with the addition of RSTATE and T_MODE.
Each channels parameters can be modiTed only while the channel is stopped or disabled.
Table 33. Parameters to be Initialized before SCC1 Is Enabled
Parameter Name
Value
T_F_DATA
0xFF
T_F_STAT
For B1: 0xE008
For B2: 0xE028
T_F_POST
0x80
Global_QH_Mode
See Section 2.2.1, “Global QH Mode.”
B_STAT1
See Section 2.6.6, “B_STAT1—B-Channel Receiver Status.”
B_STAT2
See Section 2.6.7, “B_STAT2—B-Channel Transmitter Status.”
RSTATE
See Section 2.6.1, “RSTATE—Receive Internal State.”
T_F_MASK
See Section 2.6.13, “T_F_MASK and R_F_MASK—Tx/Rx Framer Bit Masks.”
R_F_MASK
See Section 2.6.13, “T_F_MASK and R_F_MASK—Tx/Rx Framer Bit Masks.”
Table 34. Parameters to be Initialized before Every
RESTART
TX
Parameter Name
HDLC Mode Value
Transparent Mode Value
TFLGIDL
0x7E7E
0xFFFF
TTOPTMP
Flag mode: 0x8000
Idle mode: 0x0000
0x0000
BNOF
See Section 2.6.5, “BNOF—B-Channel Number of Flags.”
BTMODE
See Section 2.6.4, “BTMODE—B-Channel Transmit Mode.”
TSTATE
See Section 2.6.3, “TSTATE—Transmit Internal State.”
TFCR
See Section 2.6.10, “TFCR and RFCR—Data Buffer Function Code Registers.”
TBASE
See Section 2.6.8, “RBASE and TBASE—Descriptor Table Base Addresses.”
TBDPTR
See Section 2.6.9, “TBDPTR and RBDPTR—Tx/Rx Buffer Descriptor Pointers.”
T_MODE
See Section 2.6.2, “T_MODE—Transmit Mode.”
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