em78p210n ELAN Microelectronics Corp, em78p210n Datasheet - Page 15

• Manufacturer Part Number: em78p210n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.2) 04.22.2008
(This specification is subject to change without further notice)
"JMP" instruction allows direct loading of the lower 10 program counter bits. Thus,
"JMP" allows PC to jump to any location within a Page (1K).
"CALL" instruction loads the lower 10 bits of the PC, and then PC+1 is pushed onto the
stack. Thus, the subroutine entry address can be located anywhere within a page (1K).
"LJMP" instruction allows direct loading of the lower 11 program counter bits.
Therefore, "LJMP" allows PC to jump to any location within 2K (2
"LCALL" instruction loads the lower 11 bits of the PC, and then PC+1 is pushed onto
the stack. Thus, the subroutine entry address can be located anywhere within 2K (2
"RET" ("RETL k", "RETI") instruction loads the program counter with the contents of the
top of stack.
"ADD R2, A" allows a relative address to be added to the current PC, and the ninth and
above bits of the PC will increase progressively.
"MOV R2, A" allows loading of an address from the "A" register to the lower 8 bits of the
PC, and the ninth and above bits of the PC will remain unchanged.
Any instruction (except “ADD R2,A”) that is written to R2 (e.g., "MOV R2, A", "BC R2, 6"
etc.) will cause the ninth bit and above bits of the PC to remain unchanged.
All instructions are single instruction cycle (fclk/2) except “LCALL” and “LJMP”
instructions. The “LCALL” and “LJMP” instructions need two instructions cycle.
6.2.6 R3 (Status Register)
Bits 7~5:
Bit 4 (T):
Bit 3 (P):
Bit 2 (Z):
Bit 1 (DC):
Bit 0 (C):
Bit 7
-
Bit 6
Time-out bit. Set to 1 by the "SLEP" and "WDTC" commands or during
power-on and reset to 0 by WDT time-out.
Power-down bit. Set to 1 during power on or by a "WDTC" command
Zero flag. Set to "1" if the result of an arithmetic or logic operation is
zero.
Auxiliary carry flag
Carry flag
not used, fixed to 0 all the time.
and reset to 0 by a "SLEP" command.
-
Bit 5
Bit 4 and Bit 3 (T and P) are read only.
-
Bit 4
T
NOTE
Bit 3
8-Bit Microcontroller with OTP ROM
P
Bit 2
Z
11
).
Bit 1
DC
EM78P210N
Bit 0
C
• 9
11
).