45111 datasheet(61/184 Pages) ETC2

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7 The SASM Assembler

SX-Key/Blitz Development System Manual 2.0

• Parallax, Inc. • Page 61

The following code snippet is an example of multiple WATCH directives and their output:

LCounter

EQU $08

Hcounter

EQU $09

Flags

EQU $0A

String

EQU $0B

; (3 chars, $0B - $0D)

WATCH

LCounter, 16, UDEC

WATCH

Flags.0, 1, UBIN

WATCH

Flags.1, 1, UBIN

WATCH

String, 3, FSTR

Start

; Start of main routine

MOV

LCounter, #$10

MOV

HCounter, #$F0

MOV

Flags, #%01

MOV

String, #’H’

MOV

String+1, #’I’

MOV

String+2, #’!’

This code snippet would result in a Watch window similar to Figure 13 – The Watch Window, below:

Figure 13 - The Watch Window

The first variable in the Watch window is created by the WATCH directive on line 5 of the source code.

It tells the SX-Key to display a value starting at bit 0 of LCounter (since bit 0 is assumed if no bit address

is specified) containing 16 bits and formatted as an unsigned decimal number. Note that although

LCounter is only an 8-bit register, the WATCH directive can span multiple registers (from low-byte to

high-byte) in order to construct up to a 32-bit value. In this case, LCounter ($08) is the lower 8 bits and

HCounter ($09) is the upper 8 bits of the displayed value (61,456 or $F010).

The second and third variables in the Watch window are created by the WATCH directives on lines 6

and 7 of the source code. Both are single bit values, shown in unsigned binary format. The first of these

corresponds to Flags’ bit 0 (Flags.0) and the second corresponds to Flags’ bit 1 (Flags.1) as specified by

the symbol arguments.

The fourth variable in the Watch window is created by the last WATCH directive. It tells the SX-Key to

display a fixed-length string (FSTR) of 3 bytes starting with the String symbol. In this case, ‘HI!’ is

displayed.

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