MC68HC11KW1 Datasheet, PDF (218/238 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

A.5.4 Non-multiplexed expansion bus timing
A
(V_DD = 5.0Vdc ± 5%, V_SS = 0Vdc, T_A = T_L to T_H)
Num
Characteristic ⁽¹⁾
4.0 MHz
Symbol
Unit
Min. Max.
Frequency of operation (E clock frequency)
f_OP
0
1 E clock period
2 Pulse width, E low ^{(2), (3)}
3 Pulse width, E high ^{(2), (3), (4)}
t_CYC 250
PW_EL 105
PW_EH 100
4A E clock
4B
9 Address hold time ⁽³⁾
11 Address delay time ⁽³⁾
12 Address valid to E rise time ⁽³⁾
rise time t_R
—
fall time t_F
—
t_AH
21
t_AD
—
t_AV
34
17 Read data set-up time
t_DSR
20
18 Read data hold time
t_DHR
0
19 Write data delay time
21 Write data hold time ⁽³⁾
29 MPU address access time ^{(3), (4)}
39 Write data set-up time ^{(3), (4)}
t_DDW
—
t_DHW 31
t_ACCA 144
t_DSW 60
50 E valid chip select delay time
51 E valid chip select access time ⁽⁴⁾
t_ECSD —
t_ECSA 40
52 Chip select hold time
t_CH
0
54 Address valid chip select delay time
55 Address valid chip select access time ⁽⁴⁾
t_ACSD —
t_ACSA 113
56 Address valid to chip select time
t_AVCS 10
57 Address valid to data three-state time
t_AVDZ —
4.0 MHz
— ns
— ns
— ns
20
15
ns
— ns
71 ns
— ns
— ns
— ns
40 ns
— ns
— ns
— ns
45 ns
— ns
25 ns
103 ns
— ns
— ns
10 ns
(1) All timing is given with respect to 20% and 70% of V_DD, unless otherwise noted.
(2) Input clock duty cycles other than 50% will affect the bus performance.
(3) For f_OP ≤ 2MHz the following formulae may be used to calculate parameter values:
PW_EL = t_CYC/2 – 20ns
PW_EH = t_CYC/2 – 25ns
t_AH = t_CYC/8 – 10ns
t_AD = t_CYC/8 + 40ns
t_AV = PW_EL – t_AD
t_DHW = t_CYC/8
t_ACCA = t_CYC – t_F – t_DSR – t_AD
t_DSW = PW_EH – t_DDW
t_ECSA = PW_EH – t_ECSD – t_DSR
t_ACSA = t_CYC – t_F – t_DSR – t_ACSD
(4) Indicates a parameter affected by clock stretching. Add n(t_CYC) to the parameter value,
where n = 1, 2 or 3, depending on the valued written to the CSCSTR register.
A-14
ELECTRICAL SPECIFICATIONS
MC68HC11KW1