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ST92185B bảng dữ liệu(PDF) 151 Page - STMicroelectronics

tên linh kiện ST92185B
Giải thích chi tiết về linh kiện  16K/24K/32K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY
PDF  178 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92185B bảng dữ liệu(HTML) 151 Page - STMicroelectronics

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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont’d)
Bit 2 = CPHA:
Transmission Clock Phase.
CPHA controls the relationship between the data
on the SDI and SDO pins, and the clock signal on
the SCK pin. The CPHA bit selects the clock edge
used to capture data. It has its greatest impact on
the first bit transmitted (MSB), because it does (or
does not) allow a clock transition before the first
data capture edge. Figure 11 shows the relation-
ship between CPHA, CPOL and SCK, and indi-
cates active clock edges and strobe times.
Bit 1:0 = SPR[1:0]:
SPI Rate.
These two bits select one (of four) baud rates, to
be used as SCK.
Figure 96. SPI Data and Clock Timing
CPOL
CPHA
SCK
(in Figure 11)
0
0
1
1
0
1
0
1
(a)
(b)
(c)
(d)
SPR1 SPR0
Clock
Divider
SCK Frequency
(@ INTCLK = 24MHz)
0
0
1
1
0
1
0
1
8
16
128
256
3000kHz
1500kHz
187.5kHz
93.75kHz
(T = 0.33
µs)
(T = 0.67
µs)
(T = 5.33
µs)
(T = 10.66
µs)



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