HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 90
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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2. CPU
Reset State: The CPU resets in the reset state. When the RES pin level goes low, the power-on
reset state is entered. When the RES pin is high and the MRES pin is low, the manual reset state is
entered.
Exception Processing State: The exception processing state is a transient state that occurs when
exception processing sources such as resets or interrupts alter the CPU’s processing state flow.
For a reset, the initial values of the program counter (PC) (execution start address) and stack
pointer (SP) are fetched from the exception processing vector table and stored; the CPU then
branches to the execution start address and execution of the program begins.
For an interrupt, the stack pointer (SP) is accessed and the program counter (PC) and status
register (SR) are saved to the stack area. The exception service routine start address is fetched
from the exception processing vector table; the CPU then branches to that address and the program
starts executing, thereby entering the program execution state.
Program Execution State: In the program execution state, the CPU sequentially executes the
program.
Power-Down State: In the power-down state, the CPU operation halts and power consumption
declines. The SLEEP instruction places the CPU in the sleep mode or the software standby mode.
Bus Release State: In the bus release state, the CPU releases bus mastership to the device that has
requested them.
Rev.4.00 Mar. 27, 2008 Page 46 of 882
REJ09B0108-0400
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