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參數(shù)資料
| 型號： | 82C900 |
| 廠商： | SIEMENS AG |
| 英文描述： | Standalone TwinCAN Controller(獨(dú)立 雙CAN控制器) |
| 中文描述： | 獨(dú)立TwinCAN控制器（獨(dú)立雙的CAN控制器） |
| 文件頁數(shù)： | 8/29頁 |
| 文件大?。?/td> | 488K |
| 代理商： | 82C900 |
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82C900
Data Sheet
8
V 1.0D3, 2001-03
Preliminary
Connection to a Host Device via the Serial Interface
The second possibility to connect the 82C900 to a host device is via the serial interface.
This mode is selected if the pin MODE0=1 and MODE1=0.
The standard four-line SPI-compatible interface has been extended by a RDY signal,
which indicates that the serial interface is ready for the next access by the host.
The page size is reduced to 128 bytes per page, because the MSB of the address byte
contains a read/write indication. A special incremental access mode has been
implemented in order to reduce significantly the number of transferred bytes for
consecutive register accesses.
The 8 remaining I/O pins from the unused parallel interface are controlled by a port
control logic and can be used as I/O extension. These lines can be read or written by the
serial channel or by CAN messages. Furthermore, these lines can be programmed as
additional interrupt output lines in order to increase the number of independent
interrupts.
The output lines OUT0 and OUT1 have the same functionality in the case a parallel
interface or a serial interface connects the 82C900 to a host device.
Figure 3
Host Connection via the Serial Interface
Host
Serial Interface
CTRL3..0
RDY
OUTx
Interrupt
Control
Clock Control
TwinCAN Module
82C900
RXDCB,
TXDCB
RXDCA,
TXDCA
CAN Bus A
Transceiver
Transceiver
CAN Bus B
Port Control
I/O7..0
Input/Output
Extension
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