SH7101 datasheet(76/486 Pages) RENESAS

76 / 486 page

2. CPU

Rev.2.00 Sep. 27, 2007 Page 42 of 448

REJ09B0394-0200

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

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.

SH7101 Datasheet(PDF) 76 Page - Renesas Technology Corp