Datasheet

Section 7 Data Transfer Controller [H8S/2138 Group]
Rev. 4.00 Jun 06, 2006 page 170 of 1004
REJ09B0301-0400
The DTC transfer mode can be normal mode, repeat mode, or block transfer mode.
The 24-bit SAR designates the DTC transfer source address and the 24-bit DAR designates the
transfer destination address. After each transfer, SAR and DAR are independently incremented,
decremented, or left fixed.
Table 7.2 outlines the functions of the DTC.
Table 7.2 DTC Functions
Address Registers
Transfer Mode Activation Source
Transfer
Source
Transfer
Destination
• Normal mode
 One transfer request transfers one
byte or one word
 Memory addresses are incremented
or decremented by 1 or 2
 Up to 65,536 transfers possible
• Repeat mode
 One transfer request transfers one
byte or one word
 Memory addresses are incremented
or decremented by 1 or 2
 After the specified number of transfers
(1 to 256), the initial state resumes and
operation continues
• Block transfer mode
 One transfer request transfers a block
of the specified size
 Block size is from 1 to 256 bytes or
words
 Up to 65,536 transfers possible
 A block area can be designated at either
the source or destination
• IRQ
• FRT ICI or OCI
• 8-bit timer CMI
• Host interface IBF
• SCI TXI or RXI
• A/D converter ADI
• IIC IICI
• Software
24 bits 24 bits