Sonic Alert msm80154s user manual MSM80C154S/83C154S/85C154HVS Interrupt priority register IP, Pct

MSM80C154S/83C154S/85C154HVS

4.4.2.6 Interrupt priority register (IP)

Name	Address	MSB							LSB
		7	6	5	4	3	2	1	0
IP	0B8H	PCT	—	PT2	PS	PT1	PX1	PT0	PX0
Bit location	Flag				Function
IP.0	PX0	Interrupt priority bit for external interrupt 0.
		Priority is assigned when bit is "1".
IP.1	PT0	Interrupt priority bit for timer interrupt 0.
		Priority is assigned when bit is "1".
IP.2	PX1	Interrupt priority bit for external interrupt 1 .
		Priority is assigned when bit is " 1 ".
IP.3	PT1	Interrupt priority bit for timer interrupt 1 .
		Priority is assigned when bit is "1".
IP.4	PS	Interrupt priority bit for serial port.
		Priority is assigned when bit is "1".
IP.5	PT2	Interrupt priority bit for timer interrupt 2.
		Priority is assigned when bit is "1".
IP.6	—	Reserved bit. The output data is "1" if the bit is read.
IP.7	PCT	Priority interrupt circuit control bit.
		The priority register contents are valid and priority assigned
		interrupts can be processed when this bit is "0". When the bit is
		"1", the priority interrupt circuit is stopped, and interrupts can only
		be controlled by the interrupt enable register (IE).

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