Mailbox Configuration Register (Mbcr) - Hitachi H8S/2646 Hardware Manual

15.2.4

Mailbox Configuration Register (MBCR)

The mailbox configuration register (MBCR) is a 16-bit readable/writable register that is used to set
mailbox (buffer) transmission/reception.
MBCR
Bit:
Initial value:
R/W:
Bit:
Initial value:
R/W:
Bits 15 to 9 and 7 to 0—Mailbox Setting Register: These bits set the polarity of the
corresponding mailboxes.
Bit x: MBCRx
0
1
Bit 8—Reserved: This bit always reads 1. The write value should always be 1.
540
15 14
MBCR7 MBCR6 MBCR5
0 0
R/W R/W
7 6
MBCR15 MBCR14 MBCR13 MBCR12 MBCR11 MBCR10
0 0
R/W R/W
Description
Corresponding mailbox is set for transmission
Corresponding mailbox is set for reception
13 12 11
MBCR4 MBCR3
0 0
R/W R/W R/W
5 4
0 0
R/W R/W R/W
10 9
MBCR2 MBCR1
0 0 0
R/W R/W
3 2 1
MBCR9
0 0 0
R/W R/W
8
—
1
—
0
MBCR8
0
R/W
(Initial value)
(x = 15 to 0)