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參數資料
型號: W90210F
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結構的32位嵌入式微控制器)
中文描述: 32-BIT, MROM, RISC MICROCONTROLLER, PQFP208
封裝: PLASTIC, QFP-208
文件頁數: 66/67頁
文件大小: 297K
代理商: W90210F
W90210F
66
Version 1.4, 10/8/97
The above information is the exclusive intellectual property of Winbond Electronics Corp. and shall not be disclosed, distributed or reproduced without permssion fromWinbond.
Load Halfword Unpacked
Format:
LDHU
LDHU, cmplt
d(s,b),t
m
1
05
6
5
5
To load a halfword and unpack into a general register.
The aligned halfword at the effective address is uppacked into two bytes, zero-extended to
two halfwords and loaded into GR t. The completer, cmplt, determines if the offset is the
base register, b, or the base register plus the short displacement, d. The displacement is
encoded in the im5 field. The completer, encoded in the a and m fields of the instruction,
also specifies base register modification. If base register modification is specified and b=t,
the value loaded is the unpacked halfwords at the effective address.
switch (cmplt) {
case MB:
offset
GR[b] + low_sign_ext(im5,5);
GR[b]
GR[b] + low_sign_ext(im5,5);
break;
case MA:
offset
GR[b];
GR[b]
GR[b] + low_sign_ext(im5,5);
break;
default:
offset
GR[b] + low_sign_ext(im5,5);
break;
}
GR[t]
cat(zero_ext(mem_load(offset,0,7),16), zero_ext(mem_load(offset,8,15),16))
Exception:
None.
Restriction:
Winbond defined instruction for W90210F.
5
2
3
5
b
im5
t
0:5
5:10
11:15
27:31
26
21:25
14
s
-
a
1
Purpose:
Description:
Operation:
/* a=1,m=1 */
/* a=0,m=1 */
/* m=0 */
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