27220 Parallax Inc, 27220 Datasheet - Page 141

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

Program: SW21-EX23-74HC595-1.BS2
' {$STAMP BS2}
' {$PBASIC 2.5}
' -----[ Program Description ]---------------------------------------------
'
' This program demonstrates a simple method of turning three BASIC Stamp
' I/O pins into eight digital outputs with a 74HC595 shift register.
' -----[ I/O Definitions ]-------------------------------------------------
Clock
SerData
Latch
' -----[ Constants ]-------------------------------------------------------
DelayTime
' -----[ Variables ]-------------------------------------------------------
pattern
' -----[ Initialization ]--------------------------------------------------
Reset:
' -----[ Program Code ]----------------------------------------------------
Main:
LOW Latch
pattern = %00000001
DO
LOOP UNTIL (pattern = %10000000)
DO
LOOP UNTIL (pattern = %00000001)
GOTO Main
GOSUB Out_595
PAUSE DelayTime
pattern = pattern << 1
GOSUB Out_595
PAUSE DelayTime
pattern = pattern >> 1
PIN
PIN
PIN
CON
VAR
0
1
2
100
Byte
' shift clock (74HC595.11)
' serial data (74HC595.14)
' output latch (74HC595.12)
' zig-zag pattern
' make output and low
' put pattern on 74x595
' hold
' shift pattern left
' shift pattern right