HD6432621 Hitachi, HD6432621 Datasheet - Page 224

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

8.1.2
Figure 8-1 shows a block diagram of the DTC.
The DTC’s register information is stored in the on-chip RAM*. A 32-bit bus connects the DTC to
the on-chip RAM (1 kbyte), enabling 32-bit/1-state reading and writing of the DTC register
information.
Note: * When the DTC is used, the RAME bit in SYSCR must be set to 1.
180
Interrupt
request
Block Diagram
Legend
MRA, MRB
CRA, CRB
SAR
DAR
DTCERA to DTCERG
DTVECR
Interrupt controller
CPU interrupt
request
Figure 8-1 Block Diagram of DTC
: 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
DTC
Internal address bus
Internal data bus
On-chip
RAM