參數(shù)資料
型號: MC68HCP11A1VP2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PDIP48
封裝: DIP-48
文件頁數(shù): 61/158頁
文件大?。?/td> 776K
代理商: MC68HCP11A1VP2
MC68HC11A8
TECHNICAL DATA
SERIAL PERIPHERAL INTERFACE
MOTOROLA
6-3
6
6.3 Functional Description
Figure 6-2
shows a block diagram of the serial peripheral interface circuitry. When a
master device transmits data to a slave device via the MOSI line, the slave device re-
sponds by sending data to the master device via the master’s MISO line. This implies
full duplex transmission with both data out and data in synchronized with the same
clock signal. Thus, the byte transmitted is replaced by the byte received and eliminates
the need for separate transmit-empty and receiver-full status bits. A single status bit
(SPIF) is used to signify that the l/O operation has been completed.
The SPI is double buffered on read, but not on write. If a write is performed during data
transfer, the transfer occurs uninterrupted, and the write will be unsuccessful. This
condition will cause the write collision (WCOL) status bit in the SPSR to be set. After
a data byte is shifted, the SPIF flag of the SPSR is set.
Figure 6-2 Serial Peripheral Interface Block Diagram
In the master mode, the SCK pin is an output. It idles high or low, depending on the
CPOL bit in the SPCR, until data is written to the shift register, at which point eight
clocks are generated to shift the eight bits of data and then SCK goes idle again.
In a slave mode, the slave start logic receives a logic low at the SS pin and a clock
input at the SCK pin. Thus, the slave is synchronized with the master. Data from the
master is received serially at the slave MOSI line and loads the 8-bit shift register. After
the 8-bit shift register is loaded, its data is parallel transferred to the read buffer. During
a write cycle, data is written into the shift register, then the slave waits for a clock train
from the master to shift the data out on the slave’s MISO line.
PIN
CONTROL
LOGIC
MISO
PD2
DIVIDER
CLOCK
LOGIC
SPI STATUS (SPSR)
SPI BLOCK DIAGRAM
S
S
SPI CONTROL (SPCR)
D
M
C
C
S
S
S
W
M
8-BIT SHIFT REGISTER
READ DATA BUFFER
MSB
LSB
CLOCK
M
M
S
S
M
S
SELECT
÷
2
÷
4
÷
16
÷
32
INTERNAL
MCU SYSTEM
CLOCK
SPI CONTROL
S
S
MOSI
PD3
SCK
PD4
SS
PD5
M
S
D
MSTR
SPE
SPIE
SPI CLOCK (MSTR = 1)
8
SPI
INTERRUPT
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