8-19
INTERRUPT CONTROL UNIT
Figure 8-10. In-Service Register
8.4.6 Poll and Poll Status Registers
The Poll and Poll Status registers allow you to poll the Interrupt Control Unit and service inter-
rupts through software. You can read these registers to determine whether an interrupt is pending
and, if so, the interrupt type. The registers contain identical information, but reading them pro-
duces different results.
Register Name:
In-Service Register
Register Mnemonic:
INSERV
Register Function:
Indicates which interrupt handlers are in process
Bit
Mnemonic
Bit Name
Reset
State
Function
INT3:0
External
Interrupt In-
Service
0000 0
A bit is set to indicate that the corresponding
external interrupt is being serviced.
DMA1:0
DMA
Interrupt In-
Service
0
This bit is set to indicate that the corresponding
DMA channel interrupt is being serviced.
TMR
Timer
Interrupt In-
Service
0
This bit is set to indicate that a timer interrupt is
being serviced.
NOTE: Reserved register bits are shown with gray shading. Reserved bits must be written
to a logic zero to ensure compatibility with future Intel products.
A1192-A0
15
0
T
M
R
D
M
A
0
D
M
A
1
I
N
T
0
I
N
T
1
I
N
T
2
I
N
T
3
Содержание 80C186EA
Страница 1: ...80C186EA 80C188EA Microprocessor User s Manual...
Страница 2: ...80C186EA 80C188EA Microprocessor User s Manual 1995...
Страница 19: ......
Страница 20: ...1 Introduction...
Страница 21: ......
Страница 28: ...2 Overview of the 80C186 Family Architecture...
Страница 29: ......
Страница 79: ......
Страница 80: ...3 Bus Interface Unit...
Страница 81: ......
Страница 129: ......
Страница 130: ...4 Peripheral Control Block...
Страница 131: ......
Страница 139: ......
Страница 140: ...5 ClockGenerationand Power Management...
Страница 141: ......
Страница 165: ......
Страница 166: ...6 Chip Select Unit...
Страница 167: ......
Страница 190: ...7 Refresh Control Unit...
Страница 191: ......
Страница 205: ......
Страница 206: ...8 Interrupt Control Unit...
Страница 207: ......
Страница 239: ...INTERRUPT CONTROL UNIT 8 32...
Страница 240: ...9 Timer Counter Unit...
Страница 241: ......
Страница 265: ......
Страница 266: ...10 Direct Memory Access Unit...
Страница 267: ......
Страница 295: ...DIRECT MEMORY ACCESS UNIT 10 28...
Страница 296: ...11 Math Coprocessing...
Страница 297: ......
Страница 314: ...12 ONCE Mode...
Страница 315: ......
Страница 318: ...A 80C186 Instruction Set Additions and Extensions...
Страница 319: ......
Страница 330: ...B Input Synchronization...
Страница 331: ......
Страница 334: ...C Instruction Set Descriptions...
Страница 335: ......
Страница 383: ...INSTRUCTION SET DESCRIPTIONS C 48...
Страница 384: ...D Instruction Set Opcodes and Clock Cycles...
Страница 385: ......
Страница 408: ...Index...
Страница 409: ......