Serial Module Electrical Specifications; Serial Module General Timing Diagram - Motorola MC68340 User Manual

11.10 SERIAL MODULE ELECTRICAL SPECIFICATIONS

(d) corresponding to part operation, GND = 0 Vdc, TA = 0 to 70 C; see numbered notes; see Figures 11-15–11-18)
Num. Characteristic
1 CLKOUT Cycle Time
2 Clock Rise or Fall Time
2
3 Clock Input (X1 or SCLK ) Synchronizer Setup
Time
4 Clock Input (X1 or SCLK ) Synchronizer Hold
Time
5 TxD Data Valid from CLKOUT High
6 X1 Cycle Time
7 X1 High or Low Time
8 SCLK High or Low Time, Asynchronous (16x)
Mode
1
9 SCLK High Time, Synchronous (1x) Mode
10 SCLK Low Time, Synchronous (1x) Mode
11 TxD Data Valid from SCLK Low, Synchronous
(1x) Mode
12 RxD Setup Time to SCLK High, Synchronous
(1x) Mode
13 RxD Hold Time from SCLK High, Synchronous
(1x) Mode
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
Figure 11-15. Serial Module General Timing Diagram
11-22
Freescale Semiconductor, Inc.
Symbol
t cyc
t CS
t CH
t VLD
t X1
t X1HL
t AHL
t SH
t SL
t T D
t R
t R H
1
5
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3.3 V or
3.3 V 5.0 V
8.39 MHz 16.78 MHz
Min Max Min
119.2 — 59.6
t rf — 20 —
15 — 8, 5
30 — 15
0.5 t cyc
2.25 t cyc
0.55 t cyc + 0.75(t CS + t CH )
t cyc + t CS + t CH
t cyc (Gx) + t CS (Gx) + t CH (Gx)
greater of
({1.5t cyc (Tx) + t CS (Tx) + t VLD (Tx)} +
0.5t cyc (Rx) + t CS (Rx) + t CH (Rx)})
t SH
1.5t cyc (Tx) +
t CS (Tx) + t VLD (Tx)
0.5t cyc (Rx) + t CS (Rx) + t CH (Rx)
S
0.5t cyc (Rx) + t CS (Rx) + t CH (Rx)
(See notes (a), (b), (c), and
5.0 V
25.16 MHz
Max Min Max Unit
— 40 — ns
10 — 5 ns
— 5 — ns
— 8 — ns
Max
Min
Min
Min
Min
Min
or
Max
Min
Min
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