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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  186 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
4338F–USB–08/07
Reset Value = 0X0X 1100b
Not bit addressable
Table 45. AUXR Register
AUXR - Auxiliary Register (8Eh)
7
6
5
4
3
2
1
0
DPU
-
M0
-
XRS1
XRS0
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7
DPU
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
5
M0
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
3
XRS1
ERAM Size
XRS1XRS0
ERAM size
0
0
256 bytes
0
1
512 bytes
1
0
768 bytes
1
1
1024 bytes (default)
2
XRS0
1
EXTRAM
EXTRAM bit
Cleared to access internal ERAM using MOVX at Ri at DPTR.
Set to access external memory.
0
AO
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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