Hitachi H8S/2646 Hardware Manual page 15

Section Page
B.2 Functions 890
1009
C.12 Port F Block 1107
Diagrams
Description
UMSR—Unread Message Status Register
Bit 15
UMSR7 UMSR6
Initial value 0
Read/Write R/(W)* R/(W)*
7
Bit
UMSR15 UMSR14
Initial value 0
R/(W)* R/(W)*
Read/Write
Unread Message Status Flags
0 [Clearing condition]
Writing 1
1 Unread receive message is overwritten by a new message
[Setting condition]
When a new message is received before RXPR is cleared
Note added
Note: * Only 1 can be written, to clear the flag.
PFDR—Port F Data Register H'FF0E
Bit 7
— PF6DR
Initial value 0
Read/Write R/W R/W
14 13 12
UMSR5 UMSR4 UMSR3
0 0 0
R/(W)* R/(W)*
6 5 4
UMSR13 UMSR12 UMSR11
0 0 0
R/(W)* R/(W)* R/(W)*
Port
6 5 4
PF5DR PF4DR PF3DR
0 0 0
R/W R/W
Mode 4/5/6
Reset
*
S R
Q D
D
PF7DDR
C
WDDRF
H'F81A HCAN
11 10 9
UMSR2 UMSR1
0 0 0
R/(W)* R/(W)* R/(W)*
3 2 1
UMSR10 UMSR9
0 0 0
R/(W)* R/(W)*
(x = 15 to 0)
3 2 1
PF2DR —
0 0 Undefined
R/W R/W —
8
UMSR0
0
R/(W)*
0
UMSR8
0
R/(W)*
0
PF0DR
0
R/W