Dma I/O Register Address Pointer (Dioah/Dioal) - Fujitsu F2MC-16LX Hardware Manual

3.8.3.2

DMA I/O Register Address Pointer (DIOAH/DIOAL)

DMA I/O register address pointer (DIOAH/DIOAL) sets the I/O address pointer.
The upper address (A23 to A16) is fixed at "00
DMA I/O Register Address Pointer (DIOAH/DIOAL)
The DMA I/O register address pointer (DIOAH/DIOAL), a 16-bit length register, indicates the 16 low
order bits (A15 to A00) of the DMA I/O register address. The upper-level address (A23 to A16), containing
all "0" data, can specify any I/O address space from 000000
selection bit) of the DMA control register (DMACS) is set to "updated", the DIOA will be incremented by
1 during byte transfer or by 2 during word transfer. If this bit is set to "not updated", the DIOA will be
fixed. Figure 3.8-8 shows the DIOA configuration.
Figure 3.8-8 Bit Configuration of DMA I/O address Register Pointer (DIOAH/DIOAL)
007925 /007924
H
bit15 bit14
DIOAH/
A15 A14
DIOAL
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
R/W: Readable/Writable
X: Indeterminate
H
DIOAH
bit13 bit12 bit11 bit10 bit9 bit8
A13 A12 A11 A10 A09 A08
".
H
to 00FFFF
H
DIOAL
bit7 bit6 bit5 bit4 bit3 bit2
A07 A06 A05 A04 A03 A02
CHAPTER 3 INTERRUPT
. If the IF bit (DIOA update/fix
H
bit1 bit0
Initial value Initial value
A01 A00
XXXXXXXXXXXXXXXXB
97