M68HC05 datasheet(36/118 Pages) FREESCALE

36 / 118 page

Interrupts

MC68HC05C9A Advance Information Data Sheet, Rev. 4.1

Freescale Semiconductor

4.3 External Interrupt (IRQ or Port B)

If the interrupt mask bit (I bit) of the CCR is set, all maskable interrupts (internal and external) are disabled.

Clearing the I bit enables interrupts. The interrupt request is latched immediately following the falling edge

of IRQ. It is then synchronized internally and serviced as specified by the contents of $3FFA and $3FFB.

When any of the port B pullups are enabled, each pin becomes an additional external interrupt source

which is executed identically to the IRQ pin. Port B interrupts follow the same edge/edge-level selection

as the IRQ pin. The branch instructions BIL and BIH also respond to the port B interrupts in the same way

as the IRQ pin. See 7.3 Port B.

Either a level-sensitive and edge-sensitive trigger or an edge-sensitive-only trigger operation is

selectable. In MC68HC05C9A mode, the sensitivity is software controlled by the IRQ bit in the C9A option

C12 mask option register ($3FF1).

NOTE

The internal interrupt latch is cleared in the first part of the interrupt service

routine; therefore, one external interrupt pulse can be latched and serviced

as soon as the I bit is cleared.

Table 4-1. Vector Addresses for Interrupts and Resets

Function

Source

Local Mask

Global Mask

Priority

(1 = Highest)

Vector

Address

Reset

Power-on reset

None

$3FFE–$3FFF

RESET pin

COP watchdog

Software

interrupt

(SWI)

User code

None

Same priority

as instruction

$3FFC–$3FFD

External

interrupt

IRQ pin port B pins

None

I bit

$3FFA–$3FFB

Timer

interrupts

ICF bit

ICIE bit

I bit

$3FF8–$3FF9

OCF bit

OCIE bit

TOF bit

TOIE bit

SCI

interrupts

TDRE bit

TCIE bit

I bit

$3FF6–$3FF7

TC bit

RDRF bit

RIE bit

OR bit

IDLE bit

ILIE bit

SPI

interrupts

SPIF bit

SPIE

I bit

$3FF4–$3FF5

MODF bit

M68HC05 bảng dữ liệu(PDF) 36 Page - Freescale Semiconductor, Inc

M68HC05 bảng dữ liệu(HTML) 36 Page - Freescale Semiconductor, Inc

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

bảng dữ liệu tải về

Link URL