NT68P81 查看數據表（PDF） - Novatek Microelectronics

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NT68P81

USB Keyboard Micro-Controller

Novatek Microelectronics 

NT68P81

9.7. IN1 Token Interrupt

When an IN TOKEN for endpoint 1 is done, it will set the IN1 flag. If this interrupt is enabled by writing "1" to EIN1 ($0005H,

bit2), it will interrupt the 6502 CPU.

When an interrupt occurs, the CPU jumps to $FFFEH & $FFFFH to execute the interrupt service routine, the IN1 flag must

be cleared by the software.

9.8. IN2 Token Interrupt

When an IN TOKEN for endpoint 2 is done, it will set the IN2 flag. If this interrupt is enabled by writing "1" to EIN2 ($0005H,

bit3), it will interrupt 6502 CPU.

When an interrupt occurs, the CPU jumps to $FFFEH & $FFFFH to execute the interrupt service routine, the IN2 flag must

be cleared by the software.

9.9. STUP (SETUP) Token Interrupt

When a SETUP TOKEN for endpoint 0 is done, it will set the STUP flag. If this interrupt is enabled by writing "1" to ESTUP

($0005H, bit6), it will interrupt 6502 CPU.

When an interrupt occurs, the CPU jumps to $FFFEH & $FFFFH to execute the interrupt service routine, the STUP flag

must be cleared by the software.

9.10. SUSP Interrupt

When USB SIE detects a suspend signal, it sets the SUSP flag. Then the 6502 CPU is interrupted if the interrupt has

already been enabled by writing “1” to ESUSP ($0005H, bit7). If ESUSP flag is cleared, 6502 CPU can’t be SUSP

interrupted even if SUSP flag is set. SUSP flag can be set by H/W only and can’t be set/cleared directly by the software

except for writing “1” to CSUSP ($0004H, bit 7) flag to clear SUSP flag.

When an interrupt occurs, the CPU jumps to $FFFEH & $FFFFH to execute the interrupt service routine, the SUSP flag

must be cleared by the software.

10. I/O PORTs

The NT68P81 has 32 pins dedicated to input and output. These pins are grouped into 5 ports, as follows:

PORT0 (P00~P07)

PORT0 is an 8-bit bi-directional CMOS I/O port that is internally pulled high by PMOS. Each pin of PORT0 can be bit

programmed as an input or output port under software control. When programmed as output, data is latched to the port

data register and output to the pin. PORT0 pins with “1” written to them are pulled high by the internal PMOS pull-ups, and

can be used as inputs in that state, then these input signals can be read. The port will output high after the reset.

PORT1 (P10~P17): Functions the same as PORT0.

PORT2 (P20~P27): Functions the same as PORT0.

PORT3 (P30~P34): Functions the same as PORT0. Except for P33/P32 is shared with INT1/INT0 pin. It is also a Schmitt

Trigger input with an interrupt source of falling edge sensitive.

LED: There are three LED direct sink pins which require no external serial resistors.

The address is mapped to $000DH.

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