參數(shù)資料
型號： HIF_SPEC
英文描述： EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification
中文描述： 易- 030演示板的經(jīng)營理論主機(jī)接口（誘導(dǎo)因子）規(guī)格
文件頁數(shù)： 83/118頁
文件大小： 356K
代理商： HIF_SPEC
Host Interface (HIF) Specification
3–59
Service 291 – setim
Set Interrupt Mask
Description
This service provides the means to set the interrupt mask (IM) field and the
disable interrupts (DI) field of the current processor status register (CPS). This
field enables the external interrupt pins INTR3–INTR0, according to the
following encoding:
00 INTR0 enabled
01 INTR1–INTR0 enabled
10 INTR2–INTR0 enabled
11 INTR3–INTR0 enabled
These two bits provide for a priority-oriented enabling capability; however, the
INTR0 interrupt cannot be disabled through the IM field alone. The disable
interrupts (
di
) parameter must be set to 1 to produce this effect. A
di
value of 0
enables the selected interrupts, and a value of 2 leaves the
di
-bit of the CPS
unchanged. If this service is not implemented, an error code of
EHIFNOTAVAIL should be returned by the software. The error code for an
illegal value in registers
lr2
or
lr3
is implementation dependent.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
291 (0x123)
Service number
lr2
mask
New mask field value
lr3
di
0 = Enable interrupts
1 = Disable interrupts
2 = Leave interrupt enable unchanged
Returns:
gr96
mask
Old mask field value
gr121
0x80000000
errcode
Logical TRUE, service successful
Error number: EHIFNOTAVAIL if ser-
vice not available (implementation
dependent)
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