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IA6805E2-PDW40I

Microprocessor Unit

InnovASIC, Inc 

IA6805E2

Microprocessor Unit

Data Sheet

As of Production Version 00

Stop Modes:

The stop instruction places the MPU in low power consumption mode. The stop instruction

disables clocking of most internal registers. Timer control register bits 6 and 7 (TCR6 and

TCR7) are altered to remove any pending timer interrupt requests and to disable any further

timer interrupts. The DS and AS output lines go “low” and the RW_n line goes “high”. The

multiplexed address/data bus goes to the data input state. The high order address lines

remain at the address of the next instruction. External interrupts are enabled by clearing the

I bit in the condition code register. All other registers, memory, and I/O remain unaltered.

Only an external interrupt or reset will bring the MPU out of the stop mode. Figure 11

shows a flowchart of the stop function.

STOP

TCR BIT 7 <= 0

TCR BIT 6 <= 1

CLEAR I BIT

N

N

EXTERNAL

INTERRUPT?

Y

RESET?

Y

FETCH EXTERNAL

INTERRUPT

OR RESET VECTOR

Figure 11. STOP Function Flowchart

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