HD64F3028F25 Datasheet, PDF (223/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

7.1.3 Functional Overview
Table 7.1 gives an overview of the DMAC functions.
Table 7.1 DMAC Functional Overview
Address
Reg. Length
Transfer Mode
Activation
Destina-
Source tion
Short
I/O mode
• Compare match/input
24
8
address _{• Transfers one byte or one word}
capture A interrupts from
mode
per request
16-bit timer channels
• Increments or decrements the memory ^{0 to 2}
address by 1 or 2
• Transmit-data-empty
• Executes 1 to 65,536 transfers
interrupt from SCI channel 0
Idle mode
• Conversion-end interrupt 8
24
from A/D converter
• Transfers one byte or one word per
request
• Holds the memory address fixed
• Receive-data-full interrupt
from SCI channel 0
• Executes 1 to 65,536 transfers
• External request
24
8
Repeat mode
• Transfers one byte or one word per
request
• Increments or decrements the memory
address by 1 or 2
• Executes a specified number (1 to
255) of transfers, then returns to the
initial state and continues
Full
address
mode
Normal mode
•
• Auto-request
•
 Retains the transfer request
internally
 Executes a specified number(1 to
65,536) of transfers continuously
 Selection of burst mode or cycle-
steal mode
• External request
 Transfers one byte or one word
per request
 Executes 1 to 65,536 transfers
Auto-request
External request
24
24
Block transfer
• Compare match/ input
24
24
• Transfers one block of a specified size
capture A interrupts from
per request
16-bit timer channels 0 to 2
• Executes 1 to 65,536 transfers
• External request
• Allows either the source or destination • Conversion-end interrupt
to be a fixed block area
from A/D converter
• Block size can be 1 to 255 bytes or
words
Rev. 2.00, 09/03, page 191 of 890