HD6432646 Hitachi, HD6432646 Datasheet - Page 578

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

15.2.8
The abort acknowledge register (ABACK) is a 16-bit readable/writable register containing status
flags that indicate normal cancellation (aborting) of a mailbox (buffer) transmit messages.
Note: * Only a write of 1 is permitted, to clear the flag.
Bits 15 to 9 and 7 to 0—Abort Acknowledge Register: These bits indicate that a transmit
message in the corresponding mailbox has been canceled (aborted) normally.
Bit x: ABACKx
0
1
Bit 8—Reserved: This bit always reads 0. The write value should always be 0.
544
Initial value:
Initial value:
ABACK
Abort Acknowledge Register (ABACK)
R/W:
R/W:
Bit:
Bit:
ABACK15 ABACK14 ABACK13 ABACK12 ABACK11 ABACK10 ABACK9 ABACK8
ABACK7
R/(W)*
R/(W)*
Description
[Clearing condition]
Writing 1
Completion of transmit message cancellation for corresponding mailbox
15
0
7
0
ABACK6 ABACK5
R/(W)*
R/(W)*
14
0
6
0
R/(W)*
R/(W)*
13
0
5
0
ABACK4 ABACK3
R/(W)*
R/(W)*
12
0
4
0
R/(W)*
R/(W)*
11
0
3
0
ABACK2
R/(W)*
R/(W)*
10
0
2
0
ABACK1
R/(W)*
R/(W)*
9
0
1
0
(Initial value)
(x = 15 to 0)
R/(W)*
—
—
8
0
0
0