ST90135 datasheet(140/190 Pages) STMICROELECTRONICS

No. de pieza	ST90135

Descripción Electrónicos	8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM

PDF	190 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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ST90158 - 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 74 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 74. SPI Data and Clock Timing

CPOL

CPHA

SCK

(in Figure 74)

(a)

(b)

(c)

(d)

SPR1 SPR0

Clock

Divider

SCK Frequency

(@ INTCLK = 12MHz)

128

256

1500kHz

750kHz

93.75kHz

46.87kHz

(T = 0.67

µs)

(T = 1.33

µs)

(T = 10.66

µs)

(T = 21.33

µs)

ST90135 Datasheet(PDF) 140 Page - STMicroelectronics

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