参数资料
型号: TSS461CR
英文描述: LAN Node Controller
中文描述: 网络节点控制器
文件页数: 45/52页
文件大小: 268K
代理商: TSS461CR
TSS461C
45
Rev. D (22 Feb 01)
14. Activate, idle and sleep modes
Sleep, idle and activate commands are located in the Command Register (0x03). These three commands are general
commands for the TSS461C.
14.1. Idle and activate commands
After reset, the TSS461C starts in idle mode. In this mode, the oscillator operates (CKOUT pin active) but the circuit
cannot transmit or receive anything on the VAN bus. The TxD output (pin 18) is in three state mode, a pull-up resistor
must be be provided externally or by the line driver to avoid floating state on the VAN bus.
To activate the TSS461C, the user must set the activate bit (ACTI) and reset the idle bit (IDLE).
(max)
RxD
TxD
after reset
Idle mode
Activate mode
Activate command
3 TS
8 TS
12 TS
TS: Timeslot period
SOF
SOF
Idle command
FCS
E
A
5 TS
4 TS
RxD
INT
Idle mode
Activate mode
Figure 30. Idle and activate timings
In both cases, the idle state can be verified reading the Line Status register (0x04).
14.2. Sleep command
If the user sets the sleep bit (SLEEP), the TSS461C enters in sleep mode, whatever are the values of activate and idle
bits. It means that, all non-user registers are set-up to reduce the power consumption and the internal oscillator is
immediately stopped. However, all user registers (accessible by mP bus) are always available by the user
To exit from this mode, the user must set either the idle bit or either the activate bit.
相关PDF资料
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