HT66F13 datasheet(119/173 Pages) HOLTEK

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Interrupts

Interrupts are an important part of any microcontroller system. When an external event or an internal

function such as a Timer Module or an A/D converter requires microcontroller attention, their

corresponding interrupt will enforce a temporary suspension of the main program allowing the

microcontroller to direct attention to their respective needs. The device contains several external

interrupt and internal interrupts functions. The external interrupts are generated by the action of the

external INT0 and INT1 pins while the internal interrupts are generated by various internal functions

such as the TMs, Time Base, LVD and the A/D converter.

Interrupt Registers

Overall interrupt control, which basically means the setting of request flags when certain

microcontroller conditions occur and the setting of interrupt enable bits by the application program, is

controlled by a series of registers, located in the Special Purpose Data Memory, as shown in the

accompanying table. The number of registers depends upon the device chosen but fall into three

categories. The first is the INTC0~INTC1 registers which setup the primary interrupts, the second is

the MFI0~MFI1 registers which setup the Multi-function interrupts. Finally there is an INTEG register

to setup the external interrupt trigger edge type.

Each register contains a number of enable bits to enable or disable individual registers as well as

interrupt flags to indicate the presence of an interrupt request. The naming convention of these follows

a specific pattern. First is listed an abbreviated interrupt type, then the (optional) number of that

interrupt followed by either an

²E² for enable/ disable bit or ²F² for request flag.

Function

Enable Bit

Request Flag

Notes

Global

EMI

¾¾

INTn Pin

INTnE

INTnF

n=0or1

Multi-function

MFnE

MFnF

n=0or1

A/D Converter

ADE

ADF

Time Base

TBE

TBF

LVD

LVE

LVF

TnPE

TnPF

n=0or1

TnAE

TnAF

TnBE

TnBF

n = 1

Interrupt Register Bit Naming Conventions

Rev. 1.10

119

February 9, 2011

HT66F13/HT66F14/HT66F15

Enhanced A/D Flash Type MCU

HT66F13 Datasheet(PDF) 119 Page - Holtek Semiconductor Inc

HT66F13 Datasheet(HTML) 119 Page - Holtek Semiconductor Inc

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