81C17 Datasheet, PDF (13/18 Pages) SMSC Corporation – TWENTY PIN UART (TPUART)

Table 9 - AC CHARACTERISTICS
SYMBOL
WRITE CYCLE
t1
t2
t3
t4
t5
READ CYCLE
t6
t7
t8
t9
t10
GENERAL TIMING
t11
t12
t13
t14
t15
nCP1, nCP2 data
CLOCK FREQUENCY
DESCRIPTION
MIN TYP MAX
AC CHARACTERISTICS
UNITS
nCS, RS to nWR ↓ setup time
50
nCS, RS hold time to nWR ↑
0
nWR pulse width
100
Data BUS in setup time to nWR ↑ 75
Data BUS in hold time to nWR ↑
10
50
nCS, RS to nWR ↓ setup time
0
nCS, RS hold time to nWR ↑
100
nWR pulse width
0
Data BUS in setup time to nWR ↑ 0
Data BUS in hold time to nWR ↑
ns
ns
ns
ns
ns
ns
ns
ns
60 ns @50pf max
60 ns @50pf max
Reset Pulse Width
1.0
nCP1 active to nINT
nWR rising edge to nCP2 change
CP1, CP2 pulse width
1.0
Read Write Interval
100
µs
300 _µs @25pf
200 _µs
µs
ns
Rise Time
Fall Time
30 ns @25pf
30 ns @25pf
Rise Time
Fall Time
Internal Baud Rate Mode
External Baud Rate Mode
Duty Cycle
30
30
11.0
1.6
40/60
ns
ns
MHz
MHz
%
13