ST20C4 datasheet(23/212 Pages) STMICROELECTRONICS

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the timer will tick if the

ClockEnables bit is set to1. ClockEnables can be set using the

clockenb instruction and cleared using clockdis.

Error fla gs

The other machine flags referred to in the instruction definitions are listed in Table 3.4.

ErrorFlag is a pair of flags , one for each priority, set by the processor if an integer error

or integer overflow error occurs and the corresponding trap is not enabled. The

processor will immediately halt if the

HaltOnError flag is also set, or will contin ue

bit number

full name / description

breakpoint trap enable bit

integer error trap enable bit

integer overflow trap enable bit

illegal opcode trap enable bit

load trap trap enable bit

store trap trap enable bit

internal channel trap enable bit

external channel trap enable bit

timer trap enable bit

timeslice trap enable bit

run trap enable bit

signal trap enable bit

process interrupt trap enable bit

queue empty trap enable bit

15-14

reserved

low priority process interrupt enable bit

low priority timeslice enable bit

low priority external event enable bit

low priority timer alarm enable bit

high priority process interrupt enable bit

high priority timeslice enable bit

high priority external event enable bit

high priority timer alarm enable bit

31-24

reserved

Table 3.4 Enables register

fla g name

description

ErrorFlag

Untrapped arithmetic error flags

HaltOnErrorFlag

Halt the processor if the

ErrorFlag is set

Table 3.5 Error flags

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