IA186EM-PQF100I-R INNOVASIC [InnovASIC, Inc], IA186EM-PQF100I-R Datasheet - Page 57

• Manufacturer Part Number: IA186EM-PQF100I-R
• Description: 8/16-Bit Microcontrollers
• Manufacturer: INNOVASIC [InnovASIC, Inc]

IA186EM/IA188EM
8/16-BIT Microcontrollers
Figure 4. DMA Unit
DMA Priority
DMA transfers have a higher priority than CPU transfers, with the exception of word accesses to odd
memory locations or between locked memory addresses. The CPU cannot access memory during a DMA
transfer and a DMA transfer cannot be suspended by an interrupt request. Continuous DMA activity will
thus cause interrupt latency to suffer. However, an NMI request halts any DMA activity, enabling the
CPU to respond promptly to the request.
Destination Address Ch. 1
Destination Address Ch. 0
3737 Princeton NE, Ste 130 • Albuquerque, NM 87107 • Tel [phone] • Fax [phone] • www.Innovasic.com
20-bit Adder/Subtractor
Transfer Counter Ch. 1
Transfer Counter Ch. 0
Source Address Ch. 1
Source Address Ch. 0
20
20
Internal Address/Data Bus
Channel Control Register 1
Channel Control Register 0
Adder Control
Control
Logic
DMA
Logic
16
As of Production Version -03
Timer Request
Selection
Request
Logic
Interrupt
Request
drq1
drq0
Data Sheet