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UPD77533 bảng dữ liệu(PDF) 43 Page - Renesas Technology Corp

tên linh kiện UPD77533
Giải thích chi tiết về linh kiện  MOS INTEGRATED CIRCUIT
PDF  104 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD77533 bảng dữ liệu(HTML) 43 Page - Renesas Technology Corp

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Data Sheet S15671EJ4V0DS
41
µµµµPD77533
12.4.4 Checksum
The lower 16 bits of the sum of all the bytes from the 1-byte CMD-ID to the byte preceding the checksum are used
for the checksum.
12.4.5 End
All commands and responses end with <CR><LF>.
<CR> = 0x0D, <LF> = 0x0A
12.5 Packeting and De-packeting Server Commands
When issued by the LS, server commands are not in the packet format required for interfacing between the
µPD77533 and host CPU, and must therefore be “packeted” by the host CPU. The host CPU must similarly “de-
packet” packeted data from the
µPD77533 before sending it to the LS.
Figure 12-6. Packeting and De-packeting Server Commands
13. ACK, NACK, ERROR STATUS
In communication between the
µPD77533 and the host CPU, the transmission and reception of server and
extension commands and responses is confirmed using ACK and NACK.
Table 13-1. ACK and NACK Applications
Type
Description
ACK
Indicates that the command was received.
NACK (error status)
Indicates that the command cannot be received for some reason.
PD77533
µ
Host CPU
LS
Server command
(packet form)
Packet/de-packet
processing
Server command
(unpacketed state)
Local command,
extension command
(packet form)



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