參數(shù)資料
型號： MC68HC681FN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 35/88頁
文件大?。?/td> 461K
代理商： MC68HC681FN
Programming and Register Descriptions
4-10
MC68HC681 USER’S MANUAL
MOTOROLA
4
OP7
0 = OPR Bit 7
1 = TxRDYB
OP6
0 = OPR Bit 6
1 = TxRDYA
OP5
0 = OPR Bit 5
1 = RxRDYB/FFULLB
OP4
0 = OPR Bit 4
1 = RxRDYA/FFULLA
OP3 (Bits 3 and 2)
0 0 = OPR Bit 2
0 1 = C/T Output1
1 0 = TxCB (1X)
1 1 = TxCB (1X)
OP2 (Bits 1 and 0)
0 0 = OPR Bit 2
0 1 = TxCA (16X)
1 0 = TxCA (1X)
1 1 = RxCA (1X)
Alternate functions of OP1 and OP0 (TxRTS, RxRTR) are controlled by the mode
registers, not the OPCR. MR1A[7] and MR2A[5] control OP0; MR1B[7] and MR2B[5]
control OP1.
All bits, unless programmed for alternate function
0 = Pin driven high
1 = Pin driven low
1. If OP3 is to be used for the timer output, customers should program the counter/timer for timer mode
(ACR[6] = 1), initialize the counter/timer preload registers (CTUR and CTLR), and the start counter
command issued before setting OPCR[3:2] = 01.
Output Port Register (OPR)
76543210
OPR7
OPR6
OPR5
OPR4
OPR3
OPR2
OPR1
OPR0
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