Fujitsu FR81S User Manual
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)