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AT89C5131A-RDTUL датащи(PDF) 49 Page - ATMEL Corporation

номер детали AT89C5131A-RDTUL
подробное описание детали  8-bit Flash Microcontroller with Full Speed USB Device
PDF  185 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131A-RDTUL датащи(HTML) 49 Page - ATMEL Corporation

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49
AT89C5131A-L
4338E–USB–06/06
Reset Value = 0X0X 1100b
Not bit addressable
Table 45. AUXR Register
AUXR - Auxiliary Register (8Eh)
76
54
32
1
0
DPU
-
M0
-
XRS1
XRS0
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7DPU
Disable Weak Pull Up
Cleared to enabled weak pull up on standard Ports.
Set to disable weak pull up on standard Ports.
6-
Reserved
The value read from this bit is indeterminate. Do not set this bit
5M0
Pulse length
Cleared to stretch MOVX control: the RD and the WR pulse length is 6 clock
periods (default).
Set to stretch MOVX control: the RD and the WR pulse length is 30 clock
periods.
4-
Reserved
The value read from this bit is indeterminate. Do not set this bit
3XRS1
ERAM Size
XRS1XRS0
ERAM size
0
0
256 bytes
0
1
512 bytes
1
0
768 bytes
1
1
1024 bytes (default)
2XRS0
1
EXTRAM
EXTRAM bit
Cleared to access internal ERAM using MOVX at Ri at DPTR.
Set to access external memory.
0AO
ALE Output bit
Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or
1/3 if X2 mode is used) (default).
Set, ALE is active only when a MOVX or MOVC instruction is used.



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