mpc855t Freescale Semiconductor, Inc, mpc855t Datasheet - Page 55

• Manufacturer Part Number: mpc855t
• Description: Mpc855t Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

11.7
Table 20
1
2
Table 21
1
2
Freescale Semiconductor
Num
Num
100
101
102
103
104
105
106
107
108
The ratios SYNCCLK/RCLK1 and SYNCCLK/TCLK1 must be greater than or equal to 2.25/1.
Also applies to CD and CTS hold time when they are used as external sync signals.
100
102
103
104
105
106
107
108
The ratios SYNCCLK/RCLK1 and SYNCCLK/TCLK1 must be greater than or equal to 3/1.
Also applies to CD and CTS hold time when they are used as external sync signals.
RCLK1 and TCLK1 width high
RCLK1 and TCLK1 width low
RCLK1 and TCLK1 rise/fall time
TXD1 active delay (from TCLK1 falling edge)
RTS1 active/inactive delay (from TCLK1 falling edge)
CTS1 setup time to TCLK1 rising edge
RXD1 setup time to RCLK1 rising edge
RXD1 hold time from RCLK1 rising edge
CD1 setup Time to RCLK1 rising edge
RCLK1 and TCLK1 frequency
RCLK1 and TCLK1 rise/fall time
TXD1 active delay (from TCLK1 falling edge)
RTS1 active/inactive delay (from TCLK1 falling edge)
CTS1 setup time to TCLK1 rising edge
RXD1 setup time to RCLK1 rising edge
RXD1 hold time from RCLK1 rising edge
CD1 setup time to RCLK1 rising edge
provides the NMSI external clock timing.
provides the NMSI internal clock timing.
SCC in NMSI Mode Electrical Specifications
MPC860 PowerQUICC™ Family Hardware Specifications, Rev. 8
Characteristic
Characteristic
1
1
Table 20. NMSI External Clock Timing
Table 21. NMSI Internal Clock Timing
2
2
1/SYNCCLK + 5
1/SYNCCLK
0.00
5.00
5.00
0.00
5.00
5.00
Min
—
40.00
40.00
40.00
All Frequencies
0.00
0.00
0.00
0.00
Min
—
All Frequencies
CPM Electrical Characteristics
SYNCCLK/3
15.00
50.00
50.00
Max
30.00
30.00
Max
—
—
—
—
—
—
—
—
—
—
—
MHz
Unit
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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