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14-15
INTERFACING WITH EXTERNAL MEMORY
14.4.3 8-bit Bus Timings
When the device is configured to operate in the 8-bit bus mode, lines AD7:0 form a multiplexed
lower address and data bus. Lines AD15:8 are not multiplexed; the upper address is latched and
remains valid throughout the bus cycle. Figure 14-7 shows an idealized timing diagram for the
external read and write cycles. One cycle is required for an 8-bit read or write. A 16-bit access
requires two cycles. The first cycle accesses the lower byte, and the second cycle accesses the
upper byte. Except for requiring an extra cycle to write the bytes separately, the timings are the
same as on the 16-bit bus.
The ALE signal is used to demultiplex the lower address by strobing a transparent latch (such as
a 74AC373).
For 8-bit bus read cycles, after ALE falls, the bus controller floats the bus and drives the RD#
signal low. The external memory then must put its data on the bus. That data must be valid at the
rising edge of the RD# signal. To read a data word, the bus controller performs two consecutive
reads, reading the low byte first, followed by the high byte.
For 8-bit bus write cycles, after ALE falls, the bus controller outputs data on AD7:0 and then
drives WR# low. The external memory must latch the data by the time WR# goes high. That data
will be valid on the bus until slightly after WR# goes high. To write a data word, the bus controller
performs two consecutive writes, writing the low byte first, followed by the high byte.
Summary of Contents for 8XC196NT
Page 1: ...8XC196NT Microcontroller User s Manual...
Page 2: ...8XC196NT Microcontroller User s Manual June 1995 Order Number 272317 003...
Page 22: ...1 Guide to This Manual...
Page 23: ......
Page 35: ......
Page 36: ...2 Architectural Overview...
Page 37: ......
Page 49: ......
Page 50: ...3 Programming Considerations...
Page 51: ......
Page 66: ...4 Memory Partitions...
Page 67: ......
Page 104: ...5 Standard and PTS Interrupts...
Page 105: ......
Page 147: ......
Page 148: ...6 I O Ports...
Page 149: ......
Page 176: ...7 Serial I O SIO Port...
Page 177: ......
Page 194: ...8 Synchronous Serial I O SSIO Port...
Page 195: ......
Page 211: ......
Page 212: ...9 Slave Port...
Page 213: ......
Page 231: ......
Page 232: ...10 Event Processor Array EPA...
Page 233: ......
Page 270: ...11 Analog to digital Converter...
Page 271: ......
Page 291: ......
Page 292: ...12 Minimum Hardware Considerations...
Page 293: ......
Page 306: ...13 Special Operating Modes...
Page 307: ......
Page 317: ......
Page 318: ...14 Interfacing with External Memory...
Page 319: ......
Page 362: ...15 Programming the Nonvolatile Memory...
Page 363: ......
Page 408: ...A Instruction Set Reference...
Page 409: ......
Page 476: ...B Signal Descriptions...
Page 477: ......
Page 493: ......
Page 494: ...C Registers...
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Page 565: ......
Page 566: ...Glossary...
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Page 580: ...Index...
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