Rainbow Electronics DS89C450 - Manual (Page 9)

DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
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EXTERNAL CLOCK CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
O
= -40°C to +85°C.)
PARAMETER SYMBOL MIN MAX UNITS
Clock High Time t
CHCX
10 ns
Clock Low Time t
CLCX
10 ns
Clock Rise Time t
CLCH
5 ns
Clock Fall Time t
CHCL
5 ns
SERIAL PORT MODE 0 TIMING CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
O
= -40°C to +85°C.) ( Figure 4 )
33MHz VARIABLE
PARAMETER SYMBOL CONDITIONS
MIN MAX MIN MAX
UNITS
SM2 = 0 360 12t
CLCL
ns
Clock Cycle Time t
XLXL
SM2 = 1 120 4t
CLCL
ns
SM2 = 0 200
10t
CLCL
-
100
ns
Output Data Setup to Clock
Rising
t
QVXH
SM2 = 1 40 3t
CLCL
- 10 ns
SM2 = 0 50 2t
CLCL
- 10 ns
Output Data Hold to Clock
Rising
t
XHQX
SM2 = 1 20 t
CLCL
- 100
SM2 = 0 0 0 ns
Input Data Hold After Clock
Rising
t
XHDX
SM2 = 1 0 0
SM2 = 0 200 10t
CLCL
- 100 ns
Clock Rising Edge to Input
Data Valid
t
XHDV
SM2 = 1 40 3t
CLCL
- 50 ns
Note: SM2 is the serial port 0 mode bit 2. When serial port 0 is operating in mode 0 (SM0 = SM1 = 0), SM2 determines the number of crystal
clocks in a serial port clock cycle.