w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 32

• Manufacturer Part Number: w83l950d
• Description: Peripheral Personal Computer Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

9.
Interrupts occur by 20 sources among 24 sources, 13 external and 11 internal interrupt.
9.1
Each interrupt is controlled and corresponding to a bit in Interrupt Enable Register (IE), the Interrupt
Type Register (IT), the Interrupt Priority Control Register (IP) and the Interrupt Request Register
(IREQ). An interrupt occurs if the corresponding Interrupt Request occur and enable bits is “1”. When
several interrupts occur at the same time, the interrupts are received according to priority setting. If
interrupts are setting to same priority, then it is decided by hardware internal checking rule.
9.2
The below interrupt sources can be selected by the Interrupt Source Selection Register (INTSEL).
9.3
The occurrence sources of the external interrupt INT2, INT3, and INT4 can be selected from either
input from INT20, INT30, INT40 pin, or input from INT21, INT31, and INT41 pin by the INT2, INT3, INT4
interrupt switch bit (bit 4 of PCTRL2).
9.4
A Key input interrupt request is generated by applying "L" level to any pin of port GP3 that have been
set to input mode. In other words, it is generated when AND of input level goes from "1" to "0". An
example of using a key input interrupt is shown in blow Figure, where an Interrupt Request is generated
by pressing one of the keys consisted as an active-low key matrix which inputs to ports P30-P33.
1. INT0 or Input buffer full.
2. INT1 or Output buffer empty.
3. Serial I/O1 transmission / SCL, SDA interrupt
4. CNTR0 / SCL, SDA interrupt
5. Serial I/O2 or I2C.
6. INT2 or I2C.
7. CNTR1 or Key-on wake-up.
8. 8 A-D conversion or Key-on wake-up.
9. INT 5 or Auxiliary I2C.
10. INT 6 or Keyboard PS/2 INT.
11. INT 7 or MOUSE PS/2 INT.
12. INT 8 or Internal PS/2 INT.
13. INT 9 or Auxiliary SCL, SDA interrupt.
INTERRUPTS
Interrupt Control
Interrupt Source Selection
External interrupt Pin Selection
Key Input Interrupt (Key-on Wake Up)
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Publication Release Date: June 23, 2003
W83L950D
Revision 1.0