UPD17062 datasheet(68/298 Pages) RENESAS

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µPD17062

8.6

GENERAL-PURPOSE REGISTER POINTER (RP)

The general-purpose register pointer points to the bank and row address of the general-purpose register.

However, since RPH of the

µPD17062 is fixed at 0, only RPL (3 bits) can be specified. This means that 0

to 7 can be specified as a register pointer. Hence, in the

µPD17062, the row address of the general-purpose

8.7

PROGRAM STATUS WORD (PSWORD)

The program status word consists of a flag that indicates the result of operation by the ALU in the CPU and

a 5-bit flag that modifies the ALU function. PSWORD has a binary coded decimal (BCD) flag, compare (CMP)

flag, carry (CY) flag, zero (Z) flag, and index enable (IXE) flag. Fig. 8-6 shows the functions of these flags.

Fig. 8-6

Configuration of PSWORD

BCD

CMP

IXE

When the arithmetic operation result is other than 0, this flag

is reset. The set condition differs according to the contents of

the CMP flag.

7EH

7FH

Index

enable

flag

When this flag is set, index modification is enabled.

Zero flag

(1) When CMP = 0

The flag is set when the arithmetic operation result is 0.

(2) When CMP = 1

The flag is set when the result of the arithmetic operation

executed at Z = 1 is 0.

Carry flag

The carry flag is set when a carry occurs during the execution

of an addition instruction or when a borrow occurs during the

execution of a subtraction instruction. This flag is reset when

neither carry nor borrow occurs.

This flag is set when the least significant bit of the general-

purpose register is 1, in which the RORC instruction is executed.

The flag is reset when the bit is 0.

Compare

flag

When this flag is set, the arithmetic operation result is not

stored into data memory.

The CMP flag is reset automatically when the SKT or SKF

instruction is executed.

BCD flag

When this flag is set, all arithmetic operations are executed in

decimal. When this flag is not set, all arithmetic operations are

executed in binary.

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