参数资料
型号: TSS461E
厂商: Atmel Corp.
英文描述: VAN Data Link Controller
中文描述: 凡数据链路控制器
文件页数: 34/57页
文件大小: 817K
代理商: TSS461E
34
TSS461E
4194B–AUTO–12/04
RSTR: Reset Interrupt Reset
TER: Transmit Error Status Flag
Reset
TOKR: Transmit OK Status Flag
Reset
RER: Receive Error Status Flag
Reset
ROKR: Receive “with RAK” OK
Status Flag Reset
RNOKR: Receive “with no RAK”
OK Status Flag Reset
One:
Status flag reset
Zero:
Status flag unchanged
Figure 21.
Update of the Status Register
Channel Registers
There is a total of 14 channel register sets, each occupying 8 bytes for addressing sim-
plicity, integrated into the circuit. Each set contains two 2 x 8-bit registers for the
indentifier tag, indentifier mask and command fields plus two 1 x 8-bit registers for DMA
pointers and message status.
The base_address of each set is: (0x10 + [0x08 * channel_number]).
When the TSS461E is reset either via the external reset pin or the general reset com-
mand, the channel registers are not affected. For example, on power-up of the circuit, all
the channel registers start with random values.
Due to this fact, the user should take care to initialize all the channel registers before
exiting from idle mode. The easiest way to disable a channel register is to set the
received and transmitted bits to 1 in the Message Length & Status Register.
R
Line Status Register (0x04)
4 TS
S
S
4 TS
1 to 2 TS
6 TS
SOF
ID+COM+DATA+CRC
E
A
BUS
INT
Write “IT Status Register”
Write “Last Error Register”
Write “Last Message Register”
Write “Message Length & Status Register”
Write “Message Status”
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