78M6612-IMSLASHFSLASHP datasheet(21/111 Pages) TERIDIAN

21 / 111 page

DS_6612_001

78M6612 Data Sheet

Rev. 1.2

Accumulator (ACC, A): ACC is the accumulator register. Most instructions use the accumulator to hold

the operand. The mnemonics for accumulator-specific instructions refer to accumulator as “A”, not ACC.

B Register: The B

Program Status Word (

scratch-pad register to hold temporary data.

PSW

Table 8:

)

PSW Register

MSB

LSB

RS1

–

Bit

Symbol

Function

PSW[7]

Carry flag.

PSW[6]

Auxiliary Carry flag for BCD operations.

PSW[5]

General purpose Flag 0 available for user.

F0 is not to be confused with the F0 flag in the CE STATUS

PSW[4]

RS1

RS1 and RS0 select the

working register bank:

Bank Selected

RS1/RS0

Location

Bank 0

(0x00 – 0x07)

Bank 1

(0x08 – 0x0F)

Bank 2

(0x10 – 0x17)

Bank 3

(0x18 – 0x1F)

PSW[3]

RS0

PSW[2]

Overflow flag.

–

PSW[1]

User defined flag.

PSW[0]

Parity flag, affected by hardware to indicate odd / even number of “one” bits

in the Accumulator, i.e. even parity.

Stack Pointer (SP

Data Pointer: The data pointer (

): The stack pointer is a 1-byte register initialized to 0x07 after reset. This register is

incremented before PUSH and CALL instructions, causing the stack to begin at location 0x08.

DPTR) is 2 bytes wide. The lower part is DPL, and the highest is DPH

Program Counter: The program counter (

It can be loaded as two registers (e.g. MOV DPL,#data8). It is generally used to access external code or

data space (e.g. MOVC A,@A+DPTR or MOVX A,@DPTR respectively).

PC) is 2 bytes wide and initialized to 0x0000 after reset. This

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