參數(shù)資料
型號： 935263261557
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80
封裝： PLASTIC, QFP-80
文件頁數(shù)： 2/76頁
文件大?。?/td> 567K
代理商： 935263261557
Philips Semiconductors
Product specification
P83C557E4/P80C557E4/P89C557E4
Single-chip 8-bit microcontroller
1999 Mar 02
10
MOVX @DPTR,A
MOVX A,@DPTR
MOVX A, @Ri
MOVX @Ri, A
255
0
255
0
767
(XRAMP) = 02 H
(XRAMP) = 01 H
(XRAMP) = 00 H
0
Figure 5. Indirect addressing of AUX-RAM (768 Bytes), ARD bit in PCON = 0
512
511
256
255
6.2.2.1
AUX-RAM Page Register XRAMP
The AUX-RAM Page Register is used to select one of three 256
bytes pages of the internal 768 bytes AUX-RAM for
MOVX-accesses via R0 or R1. Its reset value is (XXXXXX00).
7
6
5
4
3
2
1
0
x
XRAMP1
XRAMP0
XRAMP (FAH)
Figure 6. AUX-RAM page register.
x: undefined during read, a write operation must write “0” to these locations
Table 3.
Description of XRAMP Bits
BIT
SYMBOL
FUNCTION
XRAMP.2–7
XRAMPx
reserved for future use
XRAMP.1
XRAMP1
AUX-RAM page select bit 1
XRAMP.0
XRAMP0
AUX-RAM page select bit 0
Table 4.
Memory Locations for All Possible MOVX Accesses
ARD1
XRAMP1
XRAMP0
MOVX @Ri,A and MOVX A,@Ri instructions access:
0
AUX-RAM
locations
0 .. 255 (reset condition)
0
1
AUX-RAM
locations 256 .. 511
0
1
0
AUX-RAM
locations 512 .. 767
0
1
no valid memory access; reserved for future use
1
X
External RAM locations
0 .. 255
MOVX @DPTR,A and MOVX A,@DPTR instructions access:
0
X
AUX-RAM
locations
0 .. 767 (reset condition)
External RAM locations 768 .. 65535
1
X
External RAM locations
0 .. 65535
NOTE:
1. ARD (AUX-RAM Disable) is a bit in the Special Function Register PCON
相關(guān)PDF資料
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935263206557 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80
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