PixArt Imaging Inc.

PAC107

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12

PixArt Imaging Inc.

V1.4, Aug, 2005

The B Register is used for both a source and destination in MUL and DIV instructions.

Accumulator.

PSW

Address: D0h

bit 7

bit 0

CY

AC

F0

RS1

RS0

OV

F1

PARITY

Program Status Word.

CY: Carry Flag

AC: Auxiliary-Carry Flag

F0:

Flag 0 available to the user for general-purpose.

RS1, RS0: 2-Bit Register Bank Address selector.

RS1 RS0

Register Bank

Address

0

0

0

00h-07h

0

1

1

08h-0Fh

1

0

2

10h-17h

1

1

3

18h-1Fh

OV: Overflow Flag

UD: User-definable Flag, General-purpose flag, available for user.

P:

Parity flag. Set/cleared by hardware each instruction cycle to indicate an odd/even

number of “1” bit in the Acc.

B

Address:F0h

bit 7

bit 0

B.3

B.6

B.4

B.7

B.5

B.2

B.1

B.0

ACC

Address:E0h

bit 7

bit 0

ACC.3

ACC.6

ACC.4

ACC.7

ACC.5

ACC.2

ACC.1

ACC.0

T2CON

Address:C8h

bit 7

bit 0

EXEN2

TR2

EXF2

TCLK

TF2

RCLK

C/T2

CP/RL2