HT49R50 Holtek Semiconductor Inc, HT49R50 Datasheet - Page 10

• Manufacturer Part Number: HT49R50
• Description: 8-Bit Microcontroller
• Manufacturer: Holtek Semiconductor Inc

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Notes: *11~*0: Program counter bits
Initial Reset
External Interrupt 0
External Interrupt 1
Timer/event counter 0 overflow
Timer/event counter 1 overflow
Time Base Interrupt
RTC Interrupt
Skip
Loading PCL
Jump, Call Branch
Return From Subroutine
Location 004H
Location 004H is reserved for the external in-
terrupt service program. If the INT0 input
pin is activated, and the interrupt is enabled,
and the stack is not full, the program begins
execution at location 004H.
Location 008H
Location 008H is reserved for the external in-
terrupt service program also. If the INT1 in-
put pin is activated, and the interrupt is
enabled, and the stack is not full, the program
begins execution at location 008H.
Location 00CH
Location 00CH is reserved for the timer/event
counter 0 interrupt service program. If a
timer interrupt results from a timer/event
counter 0 overflow, and if the interrupt is en-
abled and the stack is not full, the program
begins execution at location 00CH.
Location 010H
Location 010H is reserved for the timer/event
counter 1 interrupt service program. If a
timer interrupt results from a timer/event
#11~#0: Instruction code bits
Mode
#11 #10
S11 S10 S9
*11 *10
*11 *10
0
0
0
0
0
0
0
Program counter
0
0
0
0
0
0
0
*9
*9
#9
0
0
0
0
0
0
0
10
S8
*8
*8
#8
0
0
0
0
0
0
0
counter 1 overflow, and if the interrupt is en-
abled and the stack is not full, the program
begins execution at location 010H.
Program Counter
@7
S7
*7
#7
0
0
0
0
0
0
0
S11~S0: Stack register bits
@7~@0: PCL bits
@6
#6
S6
*6
0
0
0
0
0
0
0
PC+2
Program memory
@5
*5
#5
S5
0
0
0
0
0
0
0
@4
S4
*4
#4
0
0
0
0
1
1
1
@3
S3
*3
#3
0
0
1
1
0
0
1
@2
*2
#2
S2
August 18, 1999
0
1
0
1
0
1
0
HT49C50
@1
S1
*1
#1
0
0
0
0
0
0
0
@0
S0
*0
#0
0
0
0
0
0
0
0