Philips CEM2100/00, Руководство по обслуживанию

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Page 262
20. Serial PROM Mode
20.15 UART Timing
T
5CL8
20.15UART Timing
Table 20-19 UART Timing-1 (VDD = 4.5 to 5.5 V, fc = 2 to 16 MHz, Topr = -10 to 40°C)
Parameter Symbol Clock Frequency (fc)
Minimum Required Time
At fc = 2 MHz At fc = 16 MHz
Time from matching data reception to the echo back CMeb1 Approx. 930 465
µ
s 58.1
µ
s
Time from baud rate modification data reception to the echo back CMeb2 Approx. 980 490
µ
s 61.3
µ
s
Time from operation command reception to the echo back CMeb3 Approx. 800 400
µ
s 50
µ
s
Checksum calculation time CKsm Approx. 7864500 3.93 s 491.5
µ
s
Erasure time of an entire flash memory CEall - 30 ms 30 ms
Erasure time for a sector of a flash memory (in 4-kbyte units) CEsec - 15 ms 15 ms
Table 20-20 UART Timing-2 (VDD = 4.5 to 5.5 V, fc = 2 to 16 MHz, Topr = -10 to 40°C)
Parameter Symbol Clock Frequency (fc)
Minimum Required Time
At fc = 2 MHz At fc = 16 MHz
Time from the reset release to the acceptance of start bit of RXD pin RXsup 2100 1.05 ms 131.3 ms
Matching data transmission interval CMtr1 28500 14.2 ms 1.78 ms
Time from the echo back of matching data to the acceptance of baud rate
modification data
CMtr2 380 190
µ
s 23.8
µ
s
Time from the echo back of baud rate modification data to the acceptance
of an operation command
CMtr3 650 325
µ
s 40.6
µ
s
Time from the echo back of operation command to the acceptance of
password count storage addresses (Upper byte)
CMtr4 800 400
µ
s 50
µ
s
RESET pin
RXD pin
RXsup
(5AH)
CMeb1
(5AH)
CMtr2
(28H)
(28H)
CMeb2
CMtr3
(30H)
(30H)
CMeb3
CMtr4
TXD pin
RXD pin
TXD pin
(5AH) (5AH) (5AH)
CMtr1