Mailbox
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17.1.5.23 MSGSTATUS_4 Register (offset = D0h) [reset = 0h]
MSGSTATUS_4 is shown in Figure 17-25 and described in Table 17-37.
The message status register has the status of the messages in the mailbox
Figure 17-25. MSGSTATUS_4 Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved NBOFMSGMBM
R-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 17-37. MSGSTATUS_4 Register Field Descriptions
Bit Field Type Reset Description
2-0 NBOFMSGMBM R 0h Number of unread messages in Mailbox.
Limited to four messages per mailbox.
3270
Interprocessor Communication SPRUH73H–October 2011–Revised April 2013
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