MC68LC302 Datasheet, PDF (146/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual

Electrical Characteristics
6.18 AC ELECTRICAL SPECIFICATIONS—SERIAL
COMMUNICATIONS PORT (see Figure 6-18).
Num.
250
251
252
253
254
Characteristic
16.67 MHz
Min Max
SPCLK Clock Output Period
4 64
SPCLK Clock Output Rise/Fall Time
0 15
Delay from SPCLK to Transmit (see Note 1) 0 40
SCP Receive Setup Time (see Note 1)
40 —
SCP Receive Hold Time (see Note 1)
10 —
20 MHz
Min Max
4 64
0 10
0 30
30 —
8—
25 MHz
Min Max ^Unit
4 64 clks
0
8 ns
0 24 ns
24 — ns
7 — ns
NOTES:
1. This also applies when SPCLK is inverted by CI in the SPMODE register.
2. The enable signals for the slaves may be implemented by the parallel I/O pins.
SPCLK
(OUTPUT)
SPTXD
(OUTPUT)
SPRXD
(INPUT)
250
251
252
1
2
3
4
5
6
7
8
253
254
1
2
3
4
5
6
7
8
Figure 6-18. Serial Communication Port Timing Diagram
MOTOROLA
MC68LC302 REFERENCE MANUAL
6-29