參數(shù)資料
型號: MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 110/128頁
文件大小: 290K
代理商: MC68HC05G3
Page 72
MOTOROLA
Section 7: SERIAL PERIPHERAL INTERFACE (SPI)
MC68HC05G3 (705G4) Specification Rev. 1.1
7.4.2
SERIAL PERIPHERAL STATUS REGISTER (SPSR
x)
READ:
anytime
WRITE:
not applicable
SPIF
x
Serial transfer complete flag
The serial peripheral data transfer complete flag bit notifies the user that a data
transfer between the MC68HC05G3 (705G4) and external device has been
completed. With the completion of the data transfer, the rising edge of the eighth
pulse set SPIF
x, and if SPIEx is set, serial peripheral interrupt (SPIx) is
generated. However, during stop mode, interrupt request is serviced only in
slave mode. STOP execution never affects this SPIF
x flag or SPIEx.
When SPIF is set, the ninth clock from the clock generator or from the SCK pin
is inhibited.
Clearing the SPIF
x bit is accomplished by a software sequence of accessing the
SPSR
x while the SPIFx bit is set, followed by accessing the SPDRx (8-bit shift
register). While SPIF
x is set, all writes to the SPDRx are inhibited until SPSRx is
read by the CPU.
SPIF
x bit is a read-only bit and cleared by reset.
0 - data transfer not complete
1 - data transfer complete
SPIF1
$000B
DCOL1
0
SPSR1
B7
B6
B5
B4
B3
B2
B1
B0
00000000
RESET:
SPIF2
$000E
DCOL2
0
SPSR2
B7
B6
B5
B4
B3
B2
B1
B0
00000000
RESET:
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