參數(shù)資料
型號: MC68HC05C9AFN
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 158/160頁
文件大?。?/td> 4128K
代理商: MC68HC05C9AFN
Serial Peripheral Interface
SPI Registers
MC68HC05C9A Rev. 4.0
General Release Specification
Serial Peripheral Interface
NON-DISCLOSURE
AGREEMENT
REQUIRED
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
654321
Bit 0
Read:
SPIF
WCOL
0
MODF
0000
Write:
Reset:
00000000
= Unimplemented
Figure 10-5. SPI Status Register
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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