EM6819 datasheet(73/154 Pages) EMMICRO

73 / 154 page

EM6819

07 /09 – rev.D

www.emmicroelectronic.com

14.4 PORT A DEBOUNCER

Each Port A input has its own debouncer with an independent clock selection. The debouncer is either transparent or

clocked. The debouncer output signal is called PADeb[n]

•

Transparent Mode: The input is immediately available on its output.

•

Clocked mode: The debouncer copies is input state to its output only if during 2 consecutive debouncer clock

events the debouncer input signal remains stable. The debouncer is reset on POR, in Power-Down mode, by a

watchdog reset and a bus error reset.

Table 14.4-1 Port A Debouncer Mode and Clock selection

PA[n]DebSel1

PA[n]DebSel0

Clock

Mode

remarks

Pr1Ck7

Clocked

Clocked; 128 Hz if ck_pr1=32kHz

Pr1Ck15

Clocked

Clocked; Pr1 input clock

Pr2Ck10

Clocked

Clocked; Pr2 input clock

no clock

Transparent

Output = Input

14.5 PORT A INTERRUPT GENERATION

Each port A input may be used as Interrupt source with individual masking possibilities.

14.5.1 PA IRQ IN ACTIVE AND STANDBY MODE

The clocked PortA interrupt is generated in the Active and Standby modes only.

•

A positive or negative edge of the debouncer output signal PADeb[n] shall generate the IntPA[n]. The edge

selection is done by the register bit PAIntEdg[n] (‘1’ means a positive edge and it’s the default state).

•

The IntPA signal is the input to the interrupt controller.(refer to the interrupt controller for Irq masking and

handling).

•

All interrupt settings are independent for each PA input.

14.5.2 PA IRQ IN SLEEP MODE

In Sleep mode, any edge (positive or negative) of the PA[n] input while PAInpEn[n]=1 will generate an IntPA request.

•

The IntPA signal is the input to the interrupt controller.(refer to the interrupt controller for Irq masking and

handling).

•

All interrupt settings are independent for each PA input.

14.6 PORT A RESET FUNCTION

Each port A input can be used to generate a system reset (ResSys in Reset controller).

•

The Port A reset signal ResPA is a logical OR function of all PA input reset sources after masking.

•

The input signals for the port A reset function are coming from the Port A debouncer output PADeb[n] and can be

masked individually with RegEnResPA[n]=’0’ . Default: all inputs are masked and no PA reset is generated.

•

The ResPA is the output of the port A reset function and the input signal to the reset controller.

14.7 PORT A WAKE-UP FUNCTION

Each port A input can be used to wake-up the circuit from Power-Down mode.

•

In Power-Down mode, any state change of a selected PA[n] input while its PAInpEn[n]=1 will cancel wake-up

and resume to active mode. A PA[n] input is only selected for wake-up if its EnWkUp[n] bit is at high level.

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