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)： 28/88頁
文件大?。?/td> 461K
代理商： MC68HC681FN
Programming and Register Descriptions
4-4
MC68HC681 USER’S MANUAL
MOTOROLA
4
Table 4-3 summarizes the various output port pin functions.
RxCA 16X
CSRA[7:4] =
1110
RxCA 1X
CSRA[7:4] =
1111
TxCA 16X
CSRA[3:0] =
1110
TxCA 1X
CSRA[3:0] =
1111
RxCB 16X
CSRB[7:4] =
1110
RxCB 1X
CSRB[7:4] =
1111
TxCB 16X
CSAB[3:0] =
1110
TxCB 1X
CSRB[3:0] =
1111
TxCTSA
MR2A[4] = 1
TxCTSB
MR2B[4] = 1
NOTE:
The pin is in this mode unless program med to operate in another mode.
Table 4-3. Programming of Output Port Functions
FUNCTION
OUTPUT PORT PIN
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
General
Purpose
OPCR[7] = 0
OPCR[6] = 0
61PCR[5] = 0
OPCR[4] = 0
OPCR[3:2] = 00
OPCR[1:0] = 00
MR1B[7] = 0
MR2B[5] = 0
MR1B[7] = 0
MR2A[5] = 0
CTRDY
OPCR[3:2] = 01,
ACR[6] = 0*
Timer Output
OPCR[3:2] = 01,
ACR[6] = 1*
TxCB 1X
OPCR[3:2] = 10
RxCB
OPCR[3:2] = 11
TxCA 16X
OPCR[1:0] = 01
TxCA 1X
OPCR[1:0] = 10
RxCA 1X
OPCR[1:0] = 11
Table 4-2. Programming of Input Port Functions (Continued)
FUNCTION
INPUT PORT PIN
IP5
IP4
IP3
IP2
IP1
IP0
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