Renesas SH7641 User Manual
Page 52
Section 1 Overview
Rev. 4.00 Sep. 14, 2005 Page 2 of 828
REJ09B0023-0400
Items Specification
DSP
• Mixture of 16-bit and 32-bit instructions
• 32-/40-bit internal data paths
• Multiplier, ALU, barrel shifter and DSP register
• Large DSP data registers
Six 32-bit data registers
Two 40-bit data registers
• Extended Harvard Architecture for DSP data bus
Two data buses
One instruction bus
• Max. four parallel operations: ALU, multiply, and two load or store
• Two addressing units to generate addresses for two memory access
• DSP data addressing modes: increment, indexing (with or without
modulo addressing)
• Zero-overhead repeat loop control
• Conditional execution instructions
Clock pulse
generator (CPG)
• Clock mode: Input clock can be selected from external input (EXTAL
or CKIO) or crystal oscillator
• Three types of clocks generated:
CPU clock: maximum 100 MHz
Bus clock: maximum 50 MHz
Peripheral clock: maximum 33 MHz
• Power-down modes:
Sleep mode
Standby mode
Module standby mode
• Three types of clock modes (selectable PLL2 Ч 2 / Ч 4, clock / crystal
oscillator)
Watchdog timer
• On-chip one-channel watchdog timer
• Select from operation in watchdog-timer or interval-timer mode.
• Interrupt generation is supported for the interval-timer mode.