ST7MC2N6T3 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7MC2N6T3

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

POWER SAVING MODES (Cont’d)

8.3 WAIT MODE

Wait mode places the MCU in a low power con-

sumption mode by stopping the CPU.

This power saving mode is selected by calling the

‘WFI’ instruction.

All peripherals remain active. During Wait mode,

the I[1:0] bits of the CC register are forced to ‘10’,

to enable all interrupts. All other registers and

memory remain unchanged. The MCU remains in

Wait mode until an interrupt or RESET occurs,

whereupon the Program Counter branches to the

starting address of the interrupt or Reset service

routine.

The MCU will remain in Wait mode until a Reset or

an Interrupt occurs, causing it to wake up.

Refer to Figure 27.

Figure 27. Wait Mode Flow-chart

WFI INSTRUCTION

OSCILLATOR

PERIPHERALS

CPU

I[1:0] BITS

ON

ON

OFF

10

N

RESET

N

Y

INTERRUPT

Y

OSCILLATOR ON

PERIPHERALS OFF

CPU

ON

I[1:0] BITS

10

256 OR 4096 CPU CLOCK

CYCLE DELAY

OSCILLATOR

PERIPHERALS

CPU

I[1:0] BITS

ON

ON

ON

XX 1)

FETCH RESET VECTOR

OR SERVICE INTERRUPT

Note:

1. Before servicing an interrupt, the CC register is

pushed on the stack. The I[1:0] bits of the CC reg-

ister are set to the current software priority level of

the interrupt routine and recovered when the CC

register is popped.

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