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參數資料
型號: MC68HC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 97/160頁
文件大小: 783K
代理商: MC68HC05C9A
Serial Peripheral Interface
SPI Registers
MC68HC05C9A
Rev. 4.0
General Release Specification
MOTOROLA
Serial Peripheral Interface
97
L
G
R
10.6.2 Serial Peripheral Status Register (SPSR)
The SPI status register, shown in
Figure 10-5
, contains flags to signal
the following conditions:
SPI transmission complete
Write collision
Mode fault
SPIF — SPI Transfer Complete Flag
The serial peripheral data transfer flag bit is set upon completion of
data transfer between the processor and external device. If SPIF
goes high, and if SPIE is set, a serial peripheral interrupt is generated.
Clearing the SPIF bit is accomplished by reading the SPSR (with
SPIF set) followed by an access of the SPDR. Following the initial
transfer, unless SPSR is read (with SPIF set) first, attempts to write to
SPDR are inhibited.
Table 10-1. SPI Clock
Rate Selection
SPR[1:0]
SPI Clock Rate
00
Internal Clock
÷
2
01
Internal Clock
÷
4
10
Internal Clock
÷
16
11
Internal Clock
÷
32
SPSR
Bit 7
6
5
4
3
2
1
Bit 0
Read:
SPIF
WCOL
0
MODF
0
0
0
0
Write:
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 10-5. SPI Status Register
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