Typewriter User Manual

11-22 MC68340 USER’S MANUAL MOTOROLA
11.10 SERIAL MODULE ELECTRICAL SPECIFICATIONS (See notes (a), (b), (c), and
(d) corresponding to part operation, GND = 0 Vdc, TA = 0 to 70
°C; see numbered notes; see Figures 11-15–11-18)
3.3 V
3.3 V or
5.0 V 5.0 V
8.39 MHz 16.78 MHz 25.16 MHz
Num. Characteristic Symbol Min Max Min Max Min Max Unit
1 CLKOUT Cycle Time t
cyc
119.2 — 59.6 — 40 — ns
2 Clock Rise or Fall Time t
rf
—20—10— 5 ns
3
2
Clock Input (X1 or SCLK ) Synchronizer Setup
Time
t
CS
15 — 8, 5 — 5 — ns
4 Clock Input (X1 or SCLK ) Synchronizer Hold
Time
t
CH
30 — 15 — 8 — ns
5 TxD Data Valid from CLKOUT High t
VLD
0.5 t
cyc
Max
6 X1 Cycle Time t
X1
2.25 t
cyc
Min
7 X1 High or Low Time t
X1HL
0.55 t
cyc
+ 0.75(t
CS
+ t
CH
) Min
8 SCLK High or Low Time, Asynchronous (16x)
Mode
t
AHL
t
cyc
+ t
CS
+ t
CH
Min
9
1
SCLK High Time, Synchronous (1x) Mode t
SH
t
cyc
(Gx) + t
CS
(Gx) + t
CH
(Gx) Min
10 SCLK Low Time, Synchronous (1x) Mode t
SL
greater of
({1.5t
cyc
(Tx) + t
CS
(Tx) + t
VLD
(Tx)} +
0.5t
cyc
(Rx) + t
CS
(Rx) + t
CH
(Rx)})
or
t
SH
Min
11 TxD Data Valid from SCLK Low, Synchronous
(1x) Mode
t
T × D
1.5t
cyc
(Tx) +
t
CS
(Tx) + t
VLD
(Tx)
Max
12 RxD Setup Time to SCLK High, Synchronous
(1x) Mode
t
R × S
0.5t
cyc
(Rx) + t
CS
(Rx) + t
CH
(Rx) Min
13 RxD Hold Time from SCLK High, Synchronous
(1x) Mode
t
R × H
0.5t
cyc
(Rx) + t
CS
(Rx) + t
CH
(Rx) Min
NOTES:
(a) The electrical specifications in this document for both the 8.39 and 16.78 MHz @ 3.3 V
±0.3 V are preliminary
and apply only to the appropriate MC68340V low voltage part.
(b) The 16.78-MHz specifications apply to the MC68340 @ 5.0 V
±5% operation.
(c) The 25.16 MHz @ 5.0 V
±5% electrical specifications are preliminary.
(d) For extended temperature parts T
A
= –40 to +85
°C. These specifications are preliminary.
1. Asynchronous operation numbers take into account a receiver and transmitter operating at different clock
frequencies. (Rx) refers to receiver value. (Tx) refers to transmitter value. (Gx) refers to the value that is greater,
either receiver or transmitter.
2. Specification #3 for 16.78 MHz @ 3.3 V
±0.3 V will be 8 ns.
CLKOUT
TxD
1
5
Figure 11-15. Serial Module General Timing Diagram
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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