Datasheet

71M6513/71M6513H

3-Phase Energy Meter IC

DATA SHEET

SEPTEMBER 2011

A Maxim Integrated Products Brand

Bit Symbol Function

PSW.7

Carry flag

PSW.6

Auxiliary Carry flag for BCD operations

PSW.5 F0 General purpose Flag 0 available for user. Not to be confused with the F0 flag

in the

CESTATUS

PSW.4 RS1 Register bank select control bits. The contents of RS1 and RS0 select the working

RS1/RS0

Bank selected

Location

00 Bank 0 (0x00 – 0x07)

01 Bank 1 (0x08 – 0x0F)

10 Bank 2 (0x10 – 0x17)

11 Bank 3 (0x18 – 0x1F)

PSW.3 RS0

PSW.2 OV Overflow flag

PSW.1 - User defined flag

PSW.0 P

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

Accumulator, i.e. even parity.

Table 9: PSW bit functions

Stack Pointer (SP): 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.

Data Pointer: The data pointer (DPTR) is 2 bytes wide. The lower part is DPL, and the highest is DPH. It can be loaded as a 2-

byte register (MOV DPTR,#data16) or 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).

Program Counter: The program counter (PC) is 2 bytes wide initialized to 0x0000 after reset. This register is incremented

during the fetching operation code or when operating on data from program memory.