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8XC196MC, MD, MH USER'S MANUAL
Table 15-9. Microcontroller Meets These Specifications
Symbol
T
Address Setup to ALE/ADV# Low
AVLL
Length of time address is valid before ALE/ADV# falls. Useful when using an external latch to
demultiplex the address from the address data bus.
†
T
CLKOUT High CLKOUT Low
CHCL
CLKOUT pulse width. Useful when using CLKOUT to clock external devices.
†
T
CLKOUT Cycle Time
CLCL
The period of the CLKOUT signal; equal to 2T
†
T
CLKOUT Low to ALE/ADV# High
CLLH
T
ALE Cycle Time
LHLH
Minimum time between two ALE rising edges.
T
ALE High to ALE Low
LHLL
ALE pulse width. Useful when using an external latch to demultiplex the address from the
address data bus.
T
AD15:0 Hold after ALE/ADV# Low
LLAX
Length of time address is valid after ALE/ADV# falls. Useful when using an external latch to
demultiplex the address from the address data bus.
†
T
ALE/ADV# Low to CLKOUT High
LLCH
T
ALE/ADV# Low to RD# Low
LLRL
Length of time after ALE/ADV# falls before the microcontroller asserts RD#. Maximum time a
memory system has to decode the address before the microcontroller asserts RD#.
T
ALE/ADV# Low to WR# Low
LLWL
Length of time after ALE/ADV# falls before the microcontroller asserts WR#. Maximum time a
memory system has to decode the address before the microcontroller asserts WR#.
T
Output Data Valid to WR# High
QVWH
Length of time output data is valid before the microcontroller deasserts WR#.
T
Address (high byte) Hold after RD# High
RHAX
Minimum time the high byte of the address (when using an 8-bit data bus) is valid after the
microcontroller deasserts RD#.
T
BHE#, INST Hold after RD# High
RHBX
Minimum time these signals are valid after the microcontroller deasserts RD#.
T
RD# High to ALE High
RHLH
Time between the microcontroller deasserting RD# and the next ALE pulse. Maximum time the
memory system has to put data on the bus before the next address cycle.
T
RD# Low to Address Float
RLAZ
Time after the microcontroller deasserts RD# until it stops driving the address on the bus.
T
RD# Low to RD# High
RLRH
RD# pulse width.
†
The CLKOUT pin is available only on the 8XC196MC, MD microcontrollers.
15-34
Definition
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