Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Ficha De Dados
Códigos do produto
ATSAM4L-XSTK
743
42023E–SAM–07/2013
ATSAM4L8/L4/L2
28. Two-wire Slave Interface (TWIS)
Rev: 1.4.0.1
28.1
Features
•
Compatible with I
²
C standard
– Transfer speeds up to 3.4 Mbit/s
– 7 and 10-bit and General Call addressing
•
Compatible with SMBus standard
– Hardware Packet Error Checking (CRC) generation and verification with ACK response
– 25 ms clock low timeout delay
– 25 ms slave cumulative clock low extend time
•
Compatible with PMBus
•
DMA interface for reducing CPU load
•
Arbitrary transfer lengths, including 0 data bytes
•
Optional clock stretching if transmit or receive buffers not ready for data transfer
•
32-bit Peripheral Bus interface for configuration of the interface
28.2
Overview
The Atmel Two-wire Slave Interface (TWIS) interconnects components on a unique two-wire
bus, made up of one clock line and one data line with speeds of up to 3.4 Mbit/s, based on a
byte-oriented transfer format. It can be used with any Atmel Two-wire Interface bus, I²C, or
SMBus-compatible master. The TWIS is always a bus slave and can transfer sequential or sin-
gle bytes.
bus, made up of one clock line and one data line with speeds of up to 3.4 Mbit/s, based on a
byte-oriented transfer format. It can be used with any Atmel Two-wire Interface bus, I²C, or
SMBus-compatible master. The TWIS is always a bus slave and can transfer sequential or sin-
gle bytes.
Below,
lists the compatibility level of the Atmel Two-wire Slave Interface and a full I²C
compatible device.
Note:
1. START + b000000001 + Ack + Sr
Table 28-1.
Atmel TWIS Compatibility with I²C Standard
I²C
Standard
Atmel TWIS
Standard-mode (100 kbit/s)
Supported
Fast-mode (400 kbit/s)
Supported
High-speed-mode (3.4 Mbit/s)
Supported
7 or 10 bits Slave Addressing
Supported
START BYTE
Not Supported
Repeated Start (Sr) Condition
Supported
ACK and NAK Management
Supported
Slope control and input filtering (Fast mode)
Supported
Clock stretching
Supported