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AT83C5136-RDTUL датащи(PDF) 26 Page - ATMEL Corporation

номер детали AT83C5136-RDTUL
подробное описание детали  8-bit Microcontroller with Full Speed USB Device
PDF  171 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5136-RDTUL датащи(HTML) 26 Page - ATMEL Corporation

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AT83C5134/35/36
7683B–USB–03/07
Program/Code
Memory
The AT83C5134/35/36 implement 16 or 32 Kbytes of on-chip program/code memory.
Figure 13 shows the split of internal and external program/code memory spaces
depending on the product.
Figure 13. Program/Code Memory Organization
Note:
If the program executes exclusively from on-chip code memory (not from external mem-
ory), beware of executing code from the upper byte of on-chip memory and thereby
disrupting I/O Ports 0 and 2 due to external prefetch. Fetching code constant from this
location does not affect Ports 0 and 2.
External Code Memory
Access
Memory Interface
The external memory interface comprises the external bus (Port 0 and Port 2) as well as
the bus control signals (PSEN, and ALE).
Figure 14 shows the structure of the external address bus. P0 carries address A7:0
while P2 carries address A15:8. Data D7:0 is multiplexed with A7:0 on P0. Table 32
describes the external memory interface signals.
Figure 14. External Code Memory Interface Structure
0000h
32 Kbytes
7FFFh
ROM
32 Kbytes
External Code
FFFFh
8000h
0000h
16 Kbytes
3FFFh
ROM
48 Kbytes
External Code
FFFFh
4000h
AT83C5135
AT83C5136
Flash
EPROM
AT89C5131
P2
P0
AD7:0
A15:8
A7:0
A15:8
D7:0
A7:0
ALE
Latch
OE
PSEN



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