ia186em Innovasic Semiconductor Inc., ia186em Datasheet - Page 88

• Manufacturer Part Number: ia186em
• Description: 8-bit/16-bit Microcontrollers
• Manufacturer: Innovasic Semiconductor Inc.

IA186EM/IA188EM
8-Bit/16-Bit Microcontrollers
external interrupts or DMA requests in the respective DMA Control register. The value of these
registers is 000Fh at reset (see Table 61).
Table 61. DMA and Interrupt Control Register (Slave Mode)
5.1.40 INTSTS (030h) (Master Mode)
INTerrupt STatuS Register. The Interrupt status register contains the interrupt request status of
each of the three timers, Timer 2, Timer 1, and Timer 0 (see Table 62).
Table 62. Interrupt Status Register (Master Mode)
5.1.41 INTSTS (030h) (Slave Mode)
When nonmaskable interrupts occur, the interrupt status register controls DMA operation and the
interrupt request status of each of the three timers, Timer 2, Timer 1, and Timer 0 (see Table 63).
15
DHLT
15
14
Note: The TMR bit in the REQST register is a logical OR of these timer
interrupt requests.
Bits [15–4]—Reserved → Set to 0.
Bit [3]—MSK Mask → Any of the interrupt sources may cause an interrupt if the MSK
bit is 0. If 1, they cannot. The Interrupt Mask Register has a duplicate of this bit.
Bits [2–0]—PR2–PR0 Priority → These bits define the priority of the serial port
interrupts in relation to other interrupt signals. The interrupt priority is the lowest at 7 at
reset. The values of PR2–PR0
Bit [15]—DHLT DMA Halt → DMA activity is halted when this bit is 1. It is set to 1
automatically when any non-maskable interrupt occurs and is cleared to 0 when an IRET
instruction is executed. Interrupt handlers and other time-critical software may modify
this bit directly to disable DMA transfers. However, the DHLT bit should not be
modified by software if the timer interrupts are enabled as the function of this register
because an interrupt request register for the timers would be compromised.
Bits [14–3]—Reserved.
Bits [2–0]—TMR2–TMR0 Timer Interrupt Request → A pending interrupt request is
indicated by the respective timer, when any of these bits is 1.
14
13
13
12
12
11
Reserved
®
11
10
Reserved
10
9
9
8
8
7
UNCONTROLLED WHEN PRINTED OR COPIED
are shown
7
6
6
5
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IA211050831-16
5
4
above.
4
MSK
3
3
TMR2–TMR0
PR2–PR0
2
2
1
1
0
0
December 24, 2008
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