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8XC196K x , J x , CA USER'S MANUAL
Table 15-6. Modes 0, 1, 2, and 3 Timing Comparisons
Mode
Mode 3
Mode 0
Mode 1
Mode 2
NOTES:
1.
These are ideal timing values for purposes of comparison only. They do not
include internal device delays. Consult the data sheet for current device
specifications.
2.
N/A = This timing specification is not applicable in this mode.
15.7.1 Mode 3, Standard Mode
Mode 3 is the standard timing mode. Use this mode for systems that need to emulate the
8XC196KR.
15.7.2 Mode 0, Standard Timing with One Automatic Wait State
Mode 0 is the standard timing mode with a minimum of one wait state added to each bus cycle.
The READY signal can be used to insert additional wait states, if necessary. The T
timings are each 2 T
OSC
as in mode 3.
15.7.3 Mode 1, Long Read/Write Mode
Mode 1 is the long read/write mode (Figure 15-22). In this mode, RD#, WR#, and ALE begin ½
T
earlier in the bus cycle and the width of RD# and WR# are 1 T
OSC
The T
timing is 1 T
RLDV
get its data on the bus without the wait-state penalty of mode 0. The T
mode 1 is the same as in mode 3.
15-32
Timing Specifications (in T
T
T
T
CLLH
CHLH
AVLL
0
N/A
1
0
N/A
1
N/A
0.5
0.5
N/A
0.5
1
longer in mode 0 than in mode 3. The T
longer in mode 1 than in mode 3, allowing the memory more time to
OSC
) Note 1
OSC
T
T
T
AVDV
RLRH
RHDZ
3
1
1
5
3
1
3
2
1
3.5
2
0.5
timing in mode 0 is the same
RHDZ
OSC
AVDV
T
RLDV
1
3
2
2
and T
RLDV
AVDV
longer than in mode 3.
and T
timing in
RHDZ
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