参数资料
型号: AT83C5112
厂商: Atmel Corp.
英文描述: 8-bit Microcontroller with A/D Converter
中文描述: 8位微控制器与A / D转换器
文件页数: 43/97页
文件大小: 1229K
代理商: AT83C5112
43
AT8xC5112
4191B
8051
04/03
Table 32 describes this register and explains the use of each bit:
Table 32.
Serial Peripheral Control Register
Reset value = 00010100b
Serial Peripheral Status Register
(SPSTA)
The Serial Peripheral Status Register contains flags to signal the following conditions:
Data transfer complete
Write collision
Inconsistent logic level on SS pin (mode fault error)
7
6
5
4
3
2
1
0
SPR2
SPEN
CPOL
CPHA
SPR1
SPR0
Bit
Number
Bit
Mnemonic
R/W Mode
Description
7
SPR2
RW
Serial Peripheral Rate 2
Bit with SPR1 and SPR0 define the clock rate
6
SPEN
RW
Serial Peripheral Enable
Clear to disable the SPI interface
Set to enable the SPI interface
5
-
RW
Reserved
Leave this Bit at 0.
4
-
RW
Reserved
Leave this Bit at 1.
3
CPOL
RW
Clock Polarity
Clear to have the SCK set to
0
in idle state
Set to have the SCK set to
1
in idle low
2
CPHA
RW
Clock Phase
Clear to have the data sampled when the SPSCK leaves the idle
state (see CPOL)
Set to have the data sampled when the SPSCK returns to idle
state (see CPOL)
1
SPR1
RW
Serial Peripheral Rate (SPR2:SPR1:SPR0)
000: F
CkIdle
/2
001: F
CkIdle
/4
010: F
CkIdle
/8
011: F
CkIdle
/16
0
SPR0
RW
100: F
CkIdle
/32
101: F
CkIdle
/64
110: F
CkIdle
/128
111: External clock, output of BRG
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