ST92196A datasheet(191/268 Pages) STMICROELECTRONICS

Part #	ST92196A

Description	8/16-BIT MCU FOR TV APPLICATIONS WITH UP TO 96K ROM, ON-SCREEN-DISPLAY AND 1 OR 2 DATA SLICERS

PDF	268 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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- 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 81 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 81. SPI Data and Clock Timing

CPOL

CPHA

SCK

(in Figure 81)

(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)

ST92196A Datasheet(PDF) 191 Page - STMicroelectronics

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