參數(shù)資料
型號(hào): P83CE559
廠商: NXP Semiconductors N.V.
英文描述: Single-chip 8-bit microcontroller(8位單片微控制器)
中文描述: 單芯片8位微控制器(8位單片微控制器)
文件頁(yè)數(shù): 11/72頁(yè)
文件大小: 524K
代理商: P83CE559
Philips Semiconductors
Preliminary specification
P83CE559/P80CE559
Single-chip 8-bit microcontroller
1996 Aug 06
11
6.2.2.1
The AUX–RAM Page Register is used to select one of five 256
bytes pages of the internal 1280 bytes AUX–RAM for
MOVX–accesses via R0 or R1. Its reset value is (XXXXX000).
AUX–RAM Page Register XRAMP
7
6
5
4
3
2
1
0
x
x
x
x
x
XRAMP2
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.3–7
XRAMP.2
XRAMP.1
XRAMP.0
XRAMPx
XRAMP2
XRAMP1
XRAMP0
reserved for future use
AUX–RAM page select bit 2
AUX–RAM page select bit 1
AUX–RAM page select bit 0
Table 4.
Memory locations for all possible MOVX–accesses
ARD
1
XRAMP2
XRAMP1
XRAMP0
MOVX @Ri,A and MOVX A,@Ri instructions access:
0
0
0
0
AUX–RAM locations 0 .. 255 (reset condition)
0
0
0
1
AUX–RAM locations 256 .. 511
0
0
1
0
AUX–RAM locations 512 .. 767
0
0
1
1
AUX–RAM locations 768 ... 1023
0
1
0
0
AUX–RAM locations 1024 .. 1279
0
1
0
1
no valid memory access; reserved for future use
0
1
1
X
no valid memory access; reserved for future use
1
X
X
X
External RAM locations 0 .. 255
MOVX @DPTR,A and MOVX A,@DPTR instructions access:
0
X
X
X
AUX–RAM locations 0 .. 1279 (reset condition)
External RAM locations 1280 .. 65535
1
X
X
X
External RAM locations 0 .. 65535
NOTE:
1. ARD (AUX–RAM Disable) is a bit in the Special Function Register PCON
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