cop87l42rj National Semiconductor Corporation, cop87l42rj Datasheet - Page 19

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cop87l42rj

Manufacturer Part Number
cop87l42rj
Description
8-bit Cmos Otp Microcontrollers With 4k Or 32k Memory And Comparator
Manufacturer
National Semiconductor Corporation
Datasheet
Addressing Modes
This mode is used with the JMP and JSR instructions with
the instruction field of 12 bits replacing the lower 12 bits of
the program counter (PC). This allows jumping to any loca-
tion in the current 4k program memory segment.
ABSOLUTE LONG
This mode is used with the JMPL and JSRL instructions with
the instruction field of 15 bits replacing the entire 15 bits of
the program counter (PC). This allows jumping to any loca-
tion up to 32k in the program memory space.
INDIRECT
This mode is used with the JID instruction. The contents of
the accumulator are used as a partial address (lower 8 bits of
PC) for accessing a location in the program memory. The
contents of this program memory location serves as a partial
address (lower 8 bits of PC) for the jump to the next instruc-
tion.
Instruction Set
REGISTER AND SYMBOL DEFINITIONS
Registers
A
B
X
SP
PC
PU
PL
C
HC
GIE 1-bit of PSW register for global interrupt enable
Symbols
[B]
[X]
Mem
MemI
Imm
Reg
Bit
8-bit Accumulator register
8-bit Address register
8-bit Address register
8-bit Stack pointer register
15-bit Program counter register
upper 7 bits of PC
lower 8 bits of PC
1-bit of PSW register for carry
Half Carry
Memory indirectly addressed by B register
Memory indirectly addressed by X register
Direct address memory or [B]
Direct address memory or [B] or Immediate data
8-bit Immediate data
Register memory: addresses F0 to FF (Includes B,
X and SP)
Bit number (0 to 7)
Loaded with
Exchanged with
(Continued)
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