tPOLL
參數(shù)資料
型號(hào)： AMIS49587C5872RG
廠商： ON Semiconductor
文件頁數(shù)： 24/55頁
文件大小： 0K
描述： IC MODEM PLC 50/60MHZ 52QFN
標(biāo)準(zhǔn)包裝： 2,500
波特率： 可選
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 52-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 52-QFN（8x8）
包裝： 帶卷 (TR)
AMIS49587
http://onsemi.com
30
T_REQ
RxD
TxD
Status Message
Local Frame from Base Micro
ACK
tPOLL
tACK
tSR
Figure 26. Transfer from Application Microcontroller to AMIS49587
If the length and the checksum of the local frame are both
correct, the AMIS49587 acknowledges with an <ACK>
character. In other cases, it answers with a <NAK>
character. In case of <NAK> response, or no
acknowledgement from AMIS49587 in the tACK timeout,
a complete sequence must be restarted to repeat the frame.
6.4.6 Transfer from AMIS49587 to Application
Microcontroller
When the AMIS49587 wants to send a frame, it can
directly send it without any previous request.
T_REQ
RxD
TxD
NAK
Local Frame from
AMIS49587
Local Frame from
AMIS49587
ACK
tACK
tWBC
tACK
tWBC
Local Frame from
AMIS49587
Figure 27. Transfer from AMIS49587 to Application Microcontroller
If the length and the checksum of the local frame are both
correct, the application micro controller acknowledges with
an <ACK> character. In other cases, it answers with a
<NAK> character. In case of <NAK> response from the
Application micro controller, the AMIS49587 will repeat
the frame only once after a delay corresponding to tWBC
(Wait Before Continue). A non response from the
application micro controller or a framing error when an
<ACK> character is awaited is considered as an
acknowledgment.
6.4.7 Character Timeout in Reception
The time between two consecutive characters in a local
frame should not exceed tIC (Timeout Inter Character):
Character
tIC
t
Figure 28. Character Timeout
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