Intel 8XC196MH User Manual
15-35
INTERFACING WITH EXTERNAL MEMORY
T
WHAX
Address (high byte) Hold after WR# High
Minimum time the high byte of the address (when using an 8-bit data bus) is valid after the
microcontroller deasserts WR#.
microcontroller deasserts WR#.
T
WHBX
BHE#, INST Hold after WR# High
Minimum time these signals are valid after the microcontroller deasserts WR#.
T
WHLH
WR# High to ALE High
Time between the microcontroller deasserting WR# and next ALE pulse. Maximum time the
memory system has to get data off the bus before the next address cycle.
memory system has to get data off the bus before the next address cycle.
T
WHQX
Output Data Hold after WR# High
Length of time output data is valid on the bus after the microcontroller deasserts WR#.
T
WLWH
WR# Low to WR# High
WR# pulse width.
T
XHCH
†
XTAL1 High to CLKOUT High or Low
T
XTAL
1
1/F
XTAL
1
The period of the frequency on the XTAL1 input (F
XTAL
1
). All AC timings are referenced to
T
XTAL
1
.
Table 15-9. Microcontroller Meets These Specifications (Continued)
Symbol
Definition
†
The CLKOUT pin is available only on the 8XC196MC, MD microcontrollers.