ST7LITE20F2 datasheet(103/166 Pages) STMICROELECTRONICS

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ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

On-chip peripherals

Doc ID 8349 Rev 5

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Data I/O register (SPIDR)

Read/Write

Reset Value: Undefined

The SPIDR register is used to transmit and receive data on the serial bus. In a master

device, a write to this register will initiate transmission/reception of another byte.

Note:

During the last clock cycle the SPIF bit is set, a copy of the received data byte in the shift

buffer is actually being read.

While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR

Caution:

A write to the SPIDR register places data directly into the shift register for transmission.

A read to the SPIDR register returns the value located in the buffer and not the content of

the shift register (see Figure 42: Serial peripheral interface block diagram).

11.5

10-bit A/D converter (ADC)

11.5.1

Introduction

The analog to digital converter (ADC) peripheral is a 10-bit, successive approximation

converter with internal sample and hold circuitry. This peripheral has up to 7 multiplexed

analog input channels (refer to Table 2: Device pin description) that allow the peripheral to

convert the analog voltage levels from up to 7 different sources.

The result of the conversion is stored in a 10-bit Data Register. The A/D converter is

controlled through a Control/Status Register.

Table 43.

SPI register map and reset values

Address

(Hex.)

label

765

432

0031h

SPIDR

Reset value

MSB

xxx

LSB

0032h

SPICR

Reset value

SPIE

SPE

SPR2

MSTR

CPOL

CPHA

SPR1

SPR0

0033h

SPICSR

Reset value

SPIF

WCOL

OVR

MODF

SOD

SSM

SSI

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