z80180 ZiLOG Semiconductor, z80180 Datasheet - Page 61

• Manufacturer Part Number: z80180
• Description: Microprocessor Unit
• Manufacturer: ZiLOG Semiconductor

Timer Data Register
Timer Data Register
DMA Destination Address Register Channel 0
PS014004-1106
DMA Source Address Register, Channel 0H
DMA Source Address Register Channel 0B
Mnemonic SAR0H: Address 21h
Mnemonics SAR0B: Address 22h
(
transfers. The register contains 20 bits and can specify up to 1024 KB memory addresses or
up to 64 KB I/O addresses. Channel 0 destination can be memory, I/O, or memory mapped I/
O. For I/O, the most significant bits of this register identify the
signal for channel 0.
DAR0: I/O ADDRESS = 23h to 25h
7
—
—
7
—
6
—
—
6
—
Figure 49. DMA Channel 0H
Figure 50. DMA Channel 0B
5
—
—
5
—
—
—
—
—
4
4
) specifies the physical destination address for channel 0
DMA Channel B Address
DMA Channel 0 Address
—
—
—
3
3
2
—
—
2
—
—
—
—
1
1
—
—
0
0
REQUEST HANDSHAKE
Microprocessor Unit
Architecture
Z80180
55