Rev. 1.0, 09/01, page 380 of 904
Interrupt
request
Interrupt controller
DTC
Internal address bus
DTC activation
request
Control logic
Register information
MRA
MRB
CRA
CRB
DAR
SAR
CPU interrupt
request
On-chip
RAM
Internal data bus
Legend
MRA, MRB
CRA, CRB
SAR
DAR
DTCERA to DTCERG
DTVECR
DTCERA
to
DTCERG
DTVECR
: DTC mode registers A and B
: DTC transfer count registers A and B
: DTC source address register
: DTC destination address register
: DTC enable registers A to G
: DTC vector register
Figure 9.1 Block Diagram of DTC
9.2
Register Configuration
DTC has the following registers.
•
DTC mode register A (MRA)
•
DTC mode register B (MRB)
•
DTC source address register (SAR)
•
DTC destination address register (DAR)
•
DTC transfer count register A (CRA)
•
DTC transfer count register B (CRB)
These six registers cannot be directly accessed from the CPU. When activated, the DTC reads a
set of register information that is stored in an on-chip RAM to the corresponding DTC registers
and transfers data. After the data transfer, it writes a set of updated register information back to the
RAM.
•
DTC enable registers A to H (DTCERA to DTCERH)
•
DTC vector register (DTVECR)
Содержание H8S/2376 F-ZTAT
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