HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 21

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Table 1.1
Feature
CPU
Operating modes
2 HITACHI
Features of the SH7020 and SH7021 Microcomputers
Description
Original Hitachi architecture
32-bit internal data paths
General-register machine:
• Sixteen 32-bit general registers
• Three 32-bit control registers
• Four 32-bit system registers
RISC-type instruction set:
• Instruction length: 16-bit fixed length for improved code
• Load-store architecture (basic arithmetic and logic operations
• Delayed unconditional branch instructions reduce pipeline
• Instruction set optimized for C language
Instruction execution time: one instruction/cycle (50 ns/instruction
at 20-MHz operation)
Address space: 4 Gbytes available on the architecture
On-chip multiplier: multiplication operations (16 bits
32 bits) executed in 1–3 cycles, and multiplication/accumulation
operations (16 bits
cycles
Five-stage pipeline
Operating modes:
• On-chip ROMless mode
• On-chip ROM mode
Processing states:
• Power-on reset state
• Manual reset state
• Exception processing state
• Program execution state
• Power-down state
• Bus-released state
Power-down states:
• Sleep mode
• Software standby mode
efficiency
are executed between registers)
disruption
16 bits + 42 bits
42 bits) executed in 2–3
16 bits