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68HC705SP7 데이터시트(PDF) 143 Page - Freescale Semiconductor, Inc

부품명 68HC705SP7
상세설명  General Release Specification
PDF  230 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705SP7 데이터시트(HTML) 143 Page - Freescale Semiconductor, Inc

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Simple Serial Interface
SIOP Registers
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
General Release Specification
Simple Serial Interface
SPIR — Serial Peripheral Interrupt Reset
The SPIR bit is a write-only control to reset the SPIF flag bit in the
SSR. Reading the SPIR bit will return a logical zero.
1 = Reset the SPIF flag bit
0 = No effect
CPHA — Clock Phase
The CPHA bit controls the clock timing and phase in the SIOP. Data
is changed on the falling edge of SCK and data is captured (read) on
the rising edge of SCK. This bit is cleared by reset.
1 = SCK is idle low
0 = SCK is idle high
SPR0:1 — Serial Peripheral Clock Rate Selects
The SPR0 and SPR1 bits select one of four clock rates given in Table
9-1 to be supplied on the PB7/SCK pin when the device is configured
with the SIOP as a master (MSTR = 1). The fastest rate is when both
SPR0 and SPR1 are set. Both the SPR0 and SPR1 bits are cleared
by reset, which places the SIOP clock selection at the slowest rate.
Table 9-1. SIOP Clock Rate Selection
SPR1
SPR0
SIOP Clock Rate
(Oscillator Frequency
Divided by:)
00
64
01
32
10
16
11
8
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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