Ya you are absolutely right it’s difficult to find out now. But at89c5114 has IT register I have seen this in keil software in ASM folder which including 8051 SFR Definition. but i does not have PCA, means that IT register is some thing different of that PCA.

May you can find it in ur keil directory if you have keil on ur system (C:KeilC51ASM)

and these are the IT regg of AT89c5114 which is almost the same like AT89c52, the difference only in timer 2

;------------------- IT registers --------------------------
IEN0 DATA 0A8h
IPH0 DATA 0B7h
IPL0 DATA 0B8h
IOR DATA 0A5h

; IE0
EA BIT 0AFh
EADC BIT 0AEh
EW1 BIT 0ADh
EW0 BIT 0ACh
ET1 BIT 0ABh
EX1 BIT 0AAh
ET0 BIT 0A9h
EX0 BIT 0A8h

; IPL0
PADC BIT 0BEh
PW1 BIT 0BDh
PW0 BIT 0BCh
PT1 BIT 0BBh
PX1 BIT 0BAh
PT0 BIT 0B9h
PX0 BIT 0B8h


Albarkani