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AT89LP4052-20PI датащи(PDF) 40 Page - ATMEL Corporation

номер детали AT89LP4052-20PI
подробное описание детали  8-bit Microcontroller with 2/4-Kbyte Flash
PDF  90 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP4052-20PI датащи(HTML) 40 Page - ATMEL Corporation

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3547F–MICRO–6/06
AT89LP2052/LP4052
(SCK), and Slave Select (SS). The SCK pin is the clock output in master mode, but is the clock
input in slave mode. The MSTR bit in SPCR determines the directions of MISO and MOSI. Also
notice that MOSI connects to MOSI and MISO to MISO. In master mode, SS/P1.4 is ignored and
may be used as a general-purpose input or output. In slave mode, SS must be driven low to
select an individual device as a slave. When SS is driven high, the slave’s SPI port is deacti-
vated and the MOSI/P1.5 pin can be used as a general-purpose input.
Figure 18-1. SPI Master-Slave Interconnection
Figure 18-2. SPI Block Diagram
8-Bit Shift Register
8-Bit Shift Register
Master
Clock Generator
SPI
MISO
Slave
MISO
MOSIMOSI
SCK
SCK
SS
SS
V
CC
MSBLSB
MSBLSB
Oscillator
8-bit Shift Register
Read Data Buffer
SPI Control
SPI Status Register
SPI Interrupt
Request
Internal
Data Bus
Select
SPI Clock (Mater)
Divider
÷4÷8÷32÷64
SPI Control Register
8
8
8
MSTR
Clock
Logic
Clock
MSB
S
M
LSB
S
M
M
S
MISO
P1.6
MOSI
P1.5
SCK
1.7
SS
P1.4
SPE
Write Data Buffer



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