HD6433713 datasheet(57/324 Pages) RENESAS

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Figure 2-13 State Transitions

2.6.2 Program Execution State

In the program execution state the CPU executes program instructions in sequence.

There are two modes in this state, active mode and subactive mode. Operation is synchronized

with the system clock in active mode, and with a subclock in subactive mode. For details on these

modes, see 3.3, System Modes.

2.6.3 Program Halt State

In the program halt state there are three modes: sleep mode, standby mode, and watch mode. For

details on these modes, see 3.3, System Modes.

2.6.4 Exception-Handling State

The exception-handling state is a transient state occurring when exception handling is started by a

reset or interrupt, and the CPU changes its normal processing flow. In exception handling caused

by an interrupt, SP (R7) is referenced and the PC and CCR values are saved on the stack.

For details on interrupt handling, see 3.2.2, Interrupts.

Reset state

Program halt state

Exception-handling state

Program execution state

Reset cleared

SLEEP instruction executed

Reset

occurs

Interrupt

Reset

occurs

Exception-

handling

request

Exception-

handling

ends

Note: On the transitions between modes, see 3.3, System Modes.

Reset occurs

HD6433713 Datasheet(PDF) 57 Page - Renesas Technology Corp