MC68HC901P MOTOROLA [Motorola, Inc], MC68HC901P Datasheet - Page 59

• Manufacturer Part Number: MC68HC901P
• Description: Multi-Function Peripheral
• Manufacturer: MOTOROLA [Motorola, Inc]

Electrical Characteristics
8-6
NOTES: 1.
NUM
31
49
28
29
30
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
50
3
3
Receiver Ready (RR) Delay from Rising RC
Transmitter Ready (TR) Delay from Rising TC
TxO (A or B) Low from Rising Edge of CS or DS (Reset Time)
Timer Output (TxO) Valid from Falling t
Timer Clock (t
Timer Clock (t
Timer Clock (t
RESET Low Time
Delay to Falling IRQ from Ix Active Transition
Transmitter Interrupt Delay from Falling Edge of TC
Receiver Interrupt Delay from Rising Edge of RC (Buffer Full)
Receiver Interrupt Delay from Falling Edge of RC (Error)
SI Setup Time from Rising Edge of RC (Divide by 1 Only)
SI Hold Time from Rising Edge of RC (Divide by 1 Only)
SO Data Valid from Falling Edge of TC (Divide by 1 Only)
TC Low Time
TC High Time
TC Cycle Time
RC Low Time
RC High Time
RC Cycle Time
CS, IACK, DS Width Low
SO Data Valid from Falling Edge of TC (Divide by 16 Only)
2.
3.
4.
5.
If the setup time is not met, CS will not be recognized until the next falling clock.
If this setup time is met (for consecutive cycles), the minimum hold-off time of one clock cycle will be
obtained. If not met, the hold-off time will be two clock cycles.
t
regardless of whether that signal comes from the XTAL1/XTAL2 crystal clock inputs or the TAI or TBI timer
inputs.
CS is latched internally, therefore if specifications 1 and 24 are met, then CS may be negated before the
falling clock and still initiate a bus cycle.
Although CS and DTACK are synchronized with the clock, the data out during a read cycle is
asynchronous to the clock, relying only on CS for timing.
cyc
refers to the clock signal applied to the MFP CLK input pin. t
clk
clk
clk
) Low Time
) High Time
) Cycle Time
CHARACTERISTIC
MC68HC901 USER’S MANUAL
clk
that Causes Timeout
clk
refers to the timer clock signal,
1.05
1.05
MIN
110
110
250
500
500
500
500
350
—
—
—
—
—
—
80
—
—
—
—
—
2
2 t
clk
1000
MAX
600
600
450
380
550
800
800
440
490
80
—
—
—
—
—
—
—
—
—
+ 300
MOTOROLA
UNIT
t
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
cyc
ns
ns
ns
ns
ns
ns
ns
s
s
s