參數(shù)資料
型號(hào)： 935260833557
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, SOT-389-1, LQFP-44
文件頁(yè)數(shù)： 6/35頁(yè)
文件大?。?/td> 176K
代理商： 935260833557
1999 Apr 16
14
Philips Semiconductors
Product specication
Low-voltage microcontroller with 63-kbyte
OTP program memory and 2-kbyte RAM
P87CL881H
6.3.1
AUX-RAM PAGE REGISTER (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).
76543210
XRAMP2
XRAMP1
XRAMP0
BIT
SYMBOL
FUNCTION
7to3
reserved, undened during read, a write operation must write logic 0 to these locations
2
XRAMP2
AUX-RAM page select bit 2
1
XRAMP1
AUX-RAM page select bit 1
0
XRAMP0
AUX-RAM page select bit 0
ARD(1)
XRAMP2 XRAMP1 XRAMP0
ACCESS
INSTRUCTION TYPE
0
AUX-RAM page 0 (address 0 to 255)
MOVX @ Ri, A and
MOVX @ A, Ri
0
1
AUX-RAM page 1 (address 256 to 511)
0
1
0
AUX-RAM page 2 (address 512 to 767)
0
1
AUX-RAM page 3 (address 768 to 1023)
0
1
0
AUX-RAM page 4 (address 1024 to 1279)
0
1
0
1
AUX-RAM page 5 (address 1280 to 1535)
0
1
0
AUX-RAM page 6 (address 1536 to 1791)
0
1
no valid memory access
1
X
external RAM locations 0 to 255
0
X
AUX-RAM locations 0 to 1791 external
RAM locations 1792 to 65535
MOVX @ DPTR, A and
MOVX A, DPTR
1
X
external RAM locations 0 to 65535
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