at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 141
at83c5122
Manufacturer Part Number
at83c5122
Description
At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
Manufacturer
ATMEL Corporation
Datasheet
1.AT83C5122.pdf
(213 pages)
- Current page: 141 of 213
- Download datasheet (3Mb)
4202E–SCR–06/06
MOSI (from Master)
SCK Cycle Number
MISO (from Slave)
SCK (CPOL = 0)
SCK (CPOL = 1)
MOSI (from Master)
SPEN (internal)
MISO (from Slave)
SCK Cycle Number
SCK (CPOL = 0)
SCK (CPOL = 1)
Capture point
SS (to Slave)
SPEN (internal)
Capture Point
SS (to Slave)
Figure 86. Data Transmission Format (CPHA = 0)
Figure 87. Data Transmission Format (CPHA = 1)
As shown in Figure 86, the first SCK edge is the MSB capture strobe. Therefore the
Slave must begin driving its data before the first SCK edge, and a falling edge on the SS
pin is used to start the transmission. The SS pin must be toggled high and then low
between each byte transmitted (Figure 88).
Figure 88. CPHA/SS Timing
Figure 87 shows an SPI transmission in which CPHA is “1”. In this case, the Master
begins driving its MOSI pin on the first SCK edge. Therefore, the Slave uses the first
SCK edge as a start transmission signal. The SS pin can remain low between transmis-
MISO/MOSI
(CPHA = 0)
(CPHA = 1)
Master SS
Slave SS
Slave SS
MSB
MSB
MSB
1
MSB
1
Byte 1
2
bit6
bit6
2
bit6
bit6
3
bit5
bit5
3
bit5
bit5
Byte 2
bit4
bit4
4
bit4
bit4
4
bit3
bit3
5
bit3
bit3
5
Byte 3
6
bit2
bit2
6
bit2
bit2
7
bit1
bit1
AT8xC5122/23
7
bit1
bit1
LSB
8
LSB
LSB
8
LSB
141
Related parts for at83c5122
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: