MPC82L52 datasheet(49/144 Pages) MEGAWIN

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MEGAWIN

MPC82x52 Data Sheet

13.2. Interrupt Source

Table 13

–2. Interrupt flags

Source Name

Request Bits

Bit Location

External Interrupt, INT0

IE0

TCON.1

Timer 0

TF0

TCON.5

External Interrupt, INT1

IE1

TCON.3

Timer 1

TF1

TCON.7

Serial Port

SCON.0

SCON.1

SPI/ADC

SPIF,

WCOL,

ADCI

SPISTAT.7~6

ADCTL.4

PCA/LVF

CF,

CCFn (n=0~1),

LVF

CCON.7

CCON.1~0

PCON.5

The external interrupt INT0 and INT1 can each be either level-activated or transition-activated, depending on bits

IT0 and IT1 in register TCON. The flags that actually generate these interrupts are bits IE0 and IE1 in TCON.

When an external interrupt is generated, the flag that generated it is cleared by the hardware when the service

routine is vectored to only if the interrupt was transition

–activated, then the external requesting source is what

controls the request flag, rather than the on-chip hardware.

The Timer0 and Timer1 interrupts are generated by TF0 and TF1, which are set by a rollover in their respective

Timer/Counter registers in most cases. When a timer interrupt is generated, the flag that generated it is cleared

by the on-chip hardware when the service routine is vectored to.

The serial port interrupt is generated by the logical OR of RI and TI. Neither of these flags is cleared by hardware

when the service routine is vectored to. The service routine should poll RI and TI to determine which one to

request service and it will be cleared by software.

The SPI/ADC interrupt is shared by the logical OR of SPI interrupt (SPIF and WCOL) and ADC interrupt (ADCI).

Neither of these flags is cleared by hardware when the service routine is vectored to. The service routine should

poll them to determine which one to request service and it will be cleared by software.

The PCA/LVF interrupt is shared by the logical OR of PCA interrupt (CF, CCF0 and CCF1) and LVD (Low-

Voltage Detector) interrupt (LVF on PCON.5). Neither of these flags is cleared by hardware when the service

routine is vectored to. The service routine should poll them to determine which one to request service and it will

be cleared by software.

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