CPM Electrical Characteristics
12.5 Timer AC Electrical Specifications
Table 20 provides the general-purpose timer timings as shown in Figure 52.
Table 20. Timer Timing
All Frequencies
Num
Characteristic
Unit
Min
Max
61
62
63
64
65
TIN/TGATE rise and fall time
TIN/TGATE low time
10
1
—
—
—
—
25
ns
clk
clk
clk
ns
TIN/TGATE high time
TIN/TGATE cycle time
CLKO low to TOUT valid
2
3
3
CLKO
60
61
63
62
TIN/TGATE
(Input)
61
64
65
TOUT
(Output)
Figure 52. CPM General-Purpose Timers Timing Diagram
12.6 Serial Interface AC Electrical Specifications
Table 21 provides the serial interface timings as shown in Figure 53 to Figure 57.
Table 21. SI Timing
All Frequencies
Num
Characteristic
Unit
Min
Max
70
71
L1RCLK, L1TCLK frequency (DSC = 0) 1, 2
—
SYNCCLK
/2.5
MHz
L1RCLK, L1TCLK width low (DSC = 0) 2
P + 10
P + 10
—
—
—
ns
ns
ns
ns
ns
3
71a L1RCLK, L1TCLK width high (DSC = 0)
72
73
74
L1TXD, L1ST(1–4), L1RQ, L1CLKO rise/fall time
15.00
—
L1RSYNC, L1TSYNC valid to L1CLK edge (SYNC setup time)
L1CLK edge to L1RSYNC, L1TSYNC, invalid (SYNC hold time)
20.00
35.00
—
MPC885/MPC880 Hardware Specifications, Rev. 3
52
Freescale Semiconductor
FREESCALE [ Freescale ]
