Z8F6421PM020SC Datasheet, PDF (186/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
166
DMA_END_H—DMAx End Address High Nibble
These bits, used with the DMAx End Address Low register, form a 12-bit End Address.
The full 12-bit address is given by {DMA_END_H[3:0], DMA_END[7:0]}.
DMA_START_H—DMAx Start/Current Address High Nibble
These bits, used with the DMAx Start/Current Address Low register, form a 12-bit Start/
Current Address. The full 12-bit address is given by {DMA_START_H[3:0],
DMA_START[7:0]}.
DMAx Start/Current Address Low Byte Register
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.
Table 79. DMAx Start/Current Address Low Byte Register (DMAxSTART)
BITS
7
6
5
4
3
2
1
0
FIELD
DMA_START
RESET
R/W
ADDR
X
R/W
FB3H, FBBH
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]}.
DMAx End Address Low Byte Register
The DMAx End Address Low Byte register (Table 79), in conjunction with the DMAx_H
register (Table 80), forms a 12-bit End Address.
PS019915-1005
Direct Memory Access Controller