ST72F324J2TCRS 데이터 시트보기 (PDF) - STMicroelectronics

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ST72F324J2TCRS

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

ST72324xx-Auto

On-chip peripherals

Figure 48. Serial peripheral interface block diagram

SPIDR

Data/Address bus

Read

Read Buffer

Interrupt

request

MOSI

MISO

8-bit Shift Register

7

SPIF WCOL OVR MODF 0

SPICSR 0

SOD SSM SSI

Write

t(s) SCK

SOD

bit

bsolete Produc SS

Master

control

Serial clock

generator

SPI

state

control

1

SS

0

7

SPICR 0

SPIE SPE SPR2 MSTR CPOL CPHA SPR1 SPR0

) - O Functional description

t(s A basic example of interconnections between a single master and a single slave is

uc illustrated in Figure 49.

d The MOSI pins are connected together and the MISO pins are connected together. In this

ro way data is transferred serially between master and slave (most significant bit first).

P The communication is always initiated by the master. When the master device transmits

tedata to a slave device via MOSI pin, the slave device responds by sending data to the

lemaster device via the MISO pin. This implies full duplex communication with both data out

o and data in synchronized with the same clock signal (which is provided by the master device

bs via the SCK pin).

O To use a single data line, the MISO and MOSI pins must be connected at each node (in this

case only simplex communication is possible).

Four possible data/clock timing relationships may be chosen (see Figure 52) but master and

slave must be programmed with the same timing mode.

Doc ID 13841 Rev 1

99/193

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