MS51
Dec. 17, 2019
Page
22
of 316
Rev 1.01
M
S51
SE
RIES
TE
CHNICA
L REF
ERE
N
CE MA
NU
A
L
CONFIG1
7
6
5
4
3
2
1
0
-
-
-
-
-
LDSIZE[2:0]
-
-
-
-
-
R/W
Factory default value: 1111 1111b
Bit
Name
Description
2:0
LDSIZE[2:0]
LDROM size select
This field selects the size of LDROM.
111 = No LDROM. APROM is 16K Bytes.
110 = LDROM is 1K Bytes. APROM is 15K Bytes.
101 = LDROM is 2K Bytes. APROM is 14K Bytes.
100 = LDROM is 3K Bytes. APROM is 13K Bytes.
0xx = LDROM is 4K Bytes. APROM is 12K Bytes.
[1]
The logic boundary addresses of APROM and LDROM are defined by CONFIG1[2:0].
LDROM
0000H
0FFFH
[1]
0BFFH
[1]
07FFH
[1]
03FFH
[1]
CHPCON[1] BS = 1
0000H
CHPCON[1] BS = 0
APROM
16K bytes
3FFFH
3C00H
[1]
3800H
[1]
3400H
[1]
3000H
[1]
SPROM
FFFFH
FF80H
SPROM
Figure 6.1-1 MS51 Program Memory Map and Boot Select
