參數(shù)資料
型號(hào): P87CL881H
廠商: NXP Semiconductors N.V.
英文描述: Low-voltage microcontroller with 63-kbyte OTP program memory and 2-kbyte RAM(帶63K字節(jié)OTP程序存儲(chǔ)器和2K字節(jié)RAM的低壓微控制器)
中文描述: 低63字節(jié)OTP程序存儲(chǔ)器和2K字節(jié)RAM電壓微控制器(帶檢察官辦公室63K字節(jié)程序存儲(chǔ)器和2K字節(jié)的RAM的低壓微控制器)
文件頁數(shù): 14/32頁
文件大?。?/td> 139K
代理商: P87CL881H
1999 Apr 16
14
Philips Semiconductors
Product specification
Low-voltage microcontroller with 63-kbyte
OTP program memory and 2-kbyte RAM
P87CL881H
6.3.1
AUX-RAM P
AGE
R
EGISTER
(XRAMP)
The AUX-RAM Page Register is used to select one of the seven 256 bytes pages of the internal 1792-byte AUX-RAM
for MOVX-accesses via R0 or R1. Its reset value is ‘XXXX X000’ (AUX-RAM page 0).
Table 5
AUX-RAM Page Register (SFR address FAH)
Table 6
Description of XRAMP bits
Table 7
Memory locations for all possible MOVX accesses
Note
1.
ARD (AUX-RAM Disable) corresponds to bit 6 in the Special Function Register PCON (address 87H).
7
6
5
4
3
2
1
0
XRAMP2
XRAMP1
XRAMP0
BIT
SYMBOL
XRAMP2
XRAMP1
XRAMP0
FUNCTION
7 to 3
2
1
0
reserved, undefined during read, a write operation must write logic 0 to these locations
AUX-RAM page select bit 2
AUX-RAM page select bit 1
AUX-RAM page select bit 0
ARD
(1)
XRAMP2 XRAMP1 XRAMP0
ACCESS
INSTRUCTION TYPE
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
1
1
X
X
0
0
1
1
0
0
1
1
X
X
0
1
0
1
0
1
0
1
X
X
AUX-RAM page 0 (address 0 to 255)
AUX-RAM page 1 (address 256 to 511)
AUX-RAM page 2 (address 512 to 767)
AUX-RAM page 3 (address 768 to 1023)
AUX-RAM page 4 (address 1024 to 1279)
AUX-RAM page 5 (address 1280 to 1535)
AUX-RAM page 6 (address 1536 to 1791)
no valid memory access
external RAM locations 0 to 255
AUX-RAM locations 0 to 1791 external
RAM locations 1792 to 65535
external RAM locations 0 to 65535
MOVX @ Ri, A and
MOVX @ A, Ri
MOVX @ DPTR, A and
MOVX A, DPTR
1
X
X
X
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