Fujitsu FR81S ユーザーズマニュアル
MB91520 Series
FUJITSU SEMICONDUCTOR LIMITED
FUJITSU SEMICONDUCTOR CONFIDENTIAL
vii
Access Unit and Bit Position
4.3 Serial Status Register
The register indicates the UART state.
(Example) SSR0 (UART0) : Address 0060
H
(Access : Byte, Half-word, Word)
bit
7
6
5
4
3
2
1
0
PE
ORE
FRE
RDRF TDRE
BDS
RIE
TIE
Initial
value
value
0
0
0
0
1
0
0
0
Attribute
R/W
R/WX R/WX R/WX R/WX
R/W
R/W
R/W
If the access unit is changed, the bit position changes.
If the address offset is +0: (Example of SSR0 register)
Access size
Address
Bit position
Word
060
H
+0
H
7
6
5
4
3
2
1
0
Half-word
060
H
+0
H
15
14
13
12
11
10
9
8
Word
060
H
+0
H
31
30
29
28
27
26
25
24
Bit name
PE
ORE
FRE
RDRF TDRE
BDS
RIE
TIE
If the address offset is +1: (Example of SIDR0 register)
Access size
Address
Bit position
Word
060
H
+1
H
7
6
5
4
3
2
1
0
Half-word
060
H
+0
H
7
6
5
4
3
2
1
0
Word
060
H
+0
H
23
22
21
20
19
18
17
16
Bit name
D7
D6
D5
D4
D3
D2
D1
D0
If the address offset is +2: (Example of SCR0 register)
Access size
Address
Bit position
Word
060
H
+2
H
7
6
5
4
3
2
1
0
Half-word
060
H
+2
H
15
14
13
12
11
10
9
8
Word
060
H
+0
H
15
14
13
12
11
10
9
8
Bit name
PEN
P
SBL
CL
A/D
REC
RXE
TXE
If the address offset is +3: (Example of SMR0 register)
Access size
Address
Bit position
Word
060
H
+3
H
7
6
5
4
3
2
1
0
Half-word
060
H
+2
H
7
6
5
4
3
2
1
0
Word
060
H
+0
H
7
6
5
4
3
2
1
0
Bit name
MD1
MD0
CS2
CS1
CS0
-
SCKE
-
Register name Register abbreviation
Address
Target peripheral function
Bit position
Access unit
MN705-00010-1v0-E
(7)