z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 180

• Manufacturer Part Number: z8f1621
• Description: High Performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Table 80. DMAx Start/Current Address Low Byte Register (DMAxSTART)
Table 81. DMAx End Address Low Byte Register (DMAxEND)
PS019921-0308
BITS
FIELD
RESET
R/W
ADDR
BITS
FIELD
RESET
R/W
ADDR
DMAx Start/Current Address Low Byte Register
DMAx End Address Low Byte Register
7
7
The DMAx Start/Current Address Low register, in conjunction with the DMAx Address
High Nibble register, forms a 12-bit Start/Current Address. Writes to this register set the
Start Address for DMA operations. Each time the DMA completes a data transfer, the
12-bit Start/Current Address increments by either 1 (single-byte transfer) or 2 (two-byte
word transfer). Reads from this register return the low byte of the Current Address to be
used for the next DMA data transfer.
DMA_START—DMAx Start/Current Address Low
These bits, with the four lower bits of the DMAx_H register, form the 12-bit Start/Current
address. The full 12-bit address is given by {DMA_START_H[3:0], DMA_START[7:0]}.
The DMAx End Address Low Byte register
register
DMA_END—DMAx End Address Low
These bits, with the four upper bits of the DMAx_H register, form a 12-bit address. This
address is the ending location of the DMAx transfer. The full 12-bit address is given by
{DMA_END_H[3:0], DMA_END[7:0]}.
(Table
6
6
81), forms a 12-bit End Address.
5
5
DMA_START
4
4
FB4H, FBCH
FB3H, FBBH
DMA_END
R/W
R/W
X
X
(Table
3
3
80), in conjunction with the DMAx_H
Z8 Encore! XP
2
2
Direct Memory Access Controller
Product Specification
1
1
®
F64XX Series
0
0
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