Murata Electronics North America XDM2140 Manual Do Utilizador
8.4.3 UART Timing Values
Variable
Meaning
Min
Max
Units
t
RX_BAUD
Deviation from baud rate
-2
+2
%
t
RX_STOP
Number of stop bits
1
bit period
t
TX_BAUD
Deviation from baud rate
-1
+1
%
t
TX_STOP
Number of stop bits
1
bit period
t
SP_CTS to MT_RTS
Assertion of /SP_CTS to negation of /MT_RTS
0
10
ms
t
MT_RTS to SP_CTS
Assertion of /MT_RTS to assertion of /SP_CTS
500
ms
t
SP_CTS to TX
Assertion of /SP_CTS to start of byte
0
10
ms
t
TX to SP_CTS
Start of byte to negation of /SP_CTS
1
bit period
t
SP_CTS ack PW
Negation pulse width of /SP_CTS
500
ns
t
diag_ack_timeout
The XDM2140 responds to all requests within this time.
125
ms
t
min_strobe_length
The minimum length of the strobe signals, /TIME and /SP_CTS
500
ns
t
interbyte_timeout
Falling edge of TX to falling edge of /SP_CTS (Mode 3 only)
8
ms
t
interpacket_delay
The sender of an HDLC packet must wait at least this amount of time
before sending another packet
before sending another packet
20
ms
t
ack_delay
The max time delay between the /MT-RTS and the receiver’s
acknowledge, /SP_CTS
acknowledge, /SP_CTS
1
500
ms
t
time_ack_timeout
The XDM2140 responds to all /TIME pin activation requests within this
time
time
100
ms
Table 16
Power-on Sequence
TX
HIGH-Z
HIGH-Z
HIGH-Z
t
boot_delay
RST
MT_RTS
MT_CTS
Figure 5