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參數(shù)資料
| 型號： | SAE81C91 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 10/41頁 |
| 文件大小： | 521K |
| 代理商： | SAE81C91 |
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07Feb95@09:05h Intermediate Version
Semiconductor Group
17
SAE 81C90/91
Output Programming
TnP is the output transistor switching to V
DD, TnN switches to VSS.
TXn is the output level at the transmit pin.
Clock Control Register
The Clock Control Register determines the output frequency at pin CLKOUT which is derived from
the oscillator frequency.
The Clock Control Register requires a special protocol for writing in order to prevent the clock output
from being changed inadvertently:
q
Step 1: Write 80H to CC
q
Step 2: Write desired value to CC (bits 7...4 must be ’0000’)
Note: Not defined bit positions must be ’0’ for write accesses.
OCTP.n
OCTN.n OCP.n
Data
TnP
TnN
TXn-Level
0000 = dominant
OFF
float
0001 = recessive
OFF
float
0010
OFF
float
0011
OFF
float
0100
OFF
ON
LOW
0101
OFF
float
0110
OFF
float
0111
OFF
ON
LOW
1000
OFF
float
1001
ON
OFF
HIGH
1010
ON
OFF
HIGH
1011
OFF
float
1100
OFF
ON
LOW
1101
ON
OFF
HIGH
1110
ON
OFF
HIGH
1111
OFF
ON
LOW
CCR
76543210
Address: 14H
----
CC
Reset Value: 01H
-
wwww
Bit(field)
Function
CC
Clock Output Control
’0000’:
fCLKOUT = fOSC
’0001’:
fCLKOUT = fOSC / 2
’0010’:
fCLKOUT = fOSC / 4
’0011’:
fCLKOUT = fOSC / 6
’0100’:
fCLKOUT = fOSC / 8
’0101’:
fCLKOUT = fOSC / 10
’0110’:
CLKOUT = fOSC / 12
’0111’:
fCLKOUT = fOSC / 14
’1XXX’: fCLKOUT = LOW (clock output is switched off)
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