ST92F124 datasheet(100/429 Pages) STMICROELECTRONICS

100 / 429 page

100/429

ST92F124/F150/F250 - INTERRUPTS

5.6 EXTERNAL INTERRUPTS

The ST9 core contains 8 external interrupt sources

grouped into four pairs.

Table 19. External Interrupt Channel Grouping

Each source has a trigger control bit TEA0,..TED1

(R242,EITR.0,..,7 Page 0) to select triggering on

the rising or falling edge of the external pin. If the

Trigger control bit is set to “1”, the corresponding

pending bit IPA0,..,IPD1 (R243,EIPR.0,..,7 Page

0) is set on the input pin rising edge, if it is cleared,

the pending bit is set on the falling edge of the in-

put pin. Each source can be individually masked

through

the

corresponding

control

bit

IMA0,..,IMD1 (EIMR.7,..,0). See Figure 51.

Figure 50. Priority Level Examples

The priority level of the external interrupt sources

can be programmed among the eight priority lev-

els with the control register EIPLR (R245). The pri-

ority level of each pair is software defined using

the bits PRL2,PRL1. For each pair, the even chan-

nel (A0,B0,C0,D0) of the group has the even prior-

ity level and the odd channel (A1,B1,C1,D1) has

the odd (lower) priority level.

Figure 50 shows an example of priority levels.

Figure 51 and Table 20 give an overview of the ex-

ternal interrupts and vectors.

Table 20. Multiplexed Interrupt Sources

– The source of INTA0 can be selected between

the external pin INT0 or the Timer/Watchdog pe-

ripheral using the IA0S bit in the EIVR register

(R246 Page 0).

– The source of INTA1 can be selected between

the external pin INT1 or the Standard Timer us-

ing the INTS bit in the STC register (R232 Page

11).

– The source of INTB0 can be selected between

the external pin INT2 or the on-chip Extended

Function Timer 0 using the EFTIS bit in the CR3

– The source of INTB1 can be selected between

external pin INT3 or the on-chip Extended Func-

tion Timer 1 using the EFTIS bit in the CR3 reg-

ister (R255 Page 29).

– The source of INTC0 can be selected between

external pin INT4 or the On-chip E3 TM/Flash

Memory using bit FEIEN in the ECR register (Ad-

dress 224001h).

– The source of INTC1 can be selected between

external pin INT5 or the on-chip SPI using the

SPIS bit in the SPCR0 register (R241 Page 7).

– The source of INTD0 can be selected between

external pin INT6 or the Reset and Clock Unit

RCCU using the INT_SEL bit in the CLKCTL reg-

ister (R240 Page 55).

– The source of INTD1 can be selected between

the NMI pin and the WUIMU Wakeup/Interrupt

Lines using the ID1S bit in the WUCRTL register

(R248 Page 9).

Warning: When using external interrupt channels

shared by both external interrupts and peripherals,

special care must be taken to configure control

registers both for peripheral and interrupts.

External

Interrupt

Channel

I/O Port Pin

WKUP[0:15]

INTD1

P8[1:0] P7[7:5]

P6[7,5] P5[7:5, 2:0] P4[7,4]

INT6

INT5

INT4

INT3

INT2

INT1

INT0

INTD0

INTC1

INTC0

INTB1

INTB0

INTA1

INTA0

P6.1

P6.3

P6.2

P6.3

P6.2

P6.0

PL2D PL1D PL2C PL1C PL2B PL1B PL2A PL1A

INT.D1:

INT.C1: 001=1

INT.D0:

SOURCE

PRIORITY

SOURCE

INT.A0: 010=2

INT.A1: 011=3

INT.B1: 101=5

INT.B0: 100=4

INT.C0: 000=0

EIPLR

100=4

101=5

Channel

Internal Interrupt Source

External

Interrupt

INTA0

Timer/Watchdog

INT0

INTA1

Standard Timer

INT1

INTB0

Extended Function Timer 0

INT2

INTB1

Extended Function Timer 1

INT3

INTC0

E3 TM/Flash

INT4

INTC1

SPI Interrupt

INT5

INTD0

RCCU

INT6

INTD1

Wake-up Management Unit

ST92F124 数据表(PDF) 100 Page - STMicroelectronics

ST92F124 数据表(HTML) 100 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载