Buffer Address Pointer (Bap) - Fujitsu F2MCTM-16LX Hardware Manual

I/O register address pointer (IOA)
This is a 16-bit register that indicates the low-order address (A15 to A0) of the buffer and I/O register used
for data transfer. The high-order address (A23 to A16) are all zeroes, and any I/O between addresses
000000 and 00FFFF
H
15 14 13 12
A15 A14 A13 A12 A11 A10 A09 A08 A07 A06 A05 A04 A03 A02 A01 A00

Buffer Address Pointer (BAP)

This 24-bit register holds the address used for the next EI
Therefore, each EI
of ISCS is set to '0' (update enabled), only the low-order 16 bits of BAP changes and BAPH does not
change.
can be specified. Figure 3.7-4 is a diagram of the IOA configuration.
H
Figure 3.7-4 I/O Register Address Pointer Configuration
11 10 9 8
2
OS channel can be used for transfer with anywhere in the 16M bytes space. If the BF bit
7 6 5 4 3
2
OS transfer. BAP exists for each EI
CHAPTER 3 INTERRUPTS
2 1 0
IOA
(Undefined
when reset)
2
OS channel.
77