ST92195D datasheet(183/249 Pages) STMICROELECTRONICS

Numer części	ST92195D

Szczegółowy opis	48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER

PDF	249 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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ST92195C/D - 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 102 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 103. SPI Data and Clock Timing

CPOL

CPHA

SCK

(in Figure 102)

(a)

(b)

(c)

(d)

SPR1 SPR0

Clock

Divider

SCK Frequency

(@ INTCLK = 24MHz)

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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