COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 231

• Manufacturer Part Number: COP8SA-DM
• Description: MODULE DEBUGGING FOR COP8SA
• Manufacturer: National Semiconductor

Specifications of COP8SA-DM

• Module/board Type: Debugger Module
• For Use With/related Products: Cop 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *COP8SA-DM

4.14.1 Typical Application Requirements
Keyboard Scanning
The keyboard is organized as an 8 input by 16 output matrix. Software key rollover
eliminates the need for decoupling diodes in the 16 by 8 key matrix. The COP8SAC7’s L
port is configured as a weak pull-up input port, thus allowing the use of the Multi-Input
Wakeup feature. Most of the time the chip is in the current saving HALT mode (<4 A)
Any keystroke or a data transmission from the computer will create a high-to-low
transition one of the L lines, which wakes up the microcontroller from HALT mode. After
returning from the HALT mode, the keyboard is scanned in order to detect which key is
pressed and the appropriate key code is sent to the computer. This event-driven key-
board scanning technique results in lowest possible current consumption because the
HALT mode is used between successive keystrokes.
LED Direct Drive
Three LEDs are driven directly by three of the device high sink D-lines (15 mA sink
capability), thus eliminating the need for additional LED drivers or transistors.
• Single Chip solution
• Low cost on-chip R/C oscillator (or optional ceramic oscillator)
• Output pins have LED direct drive capability
• Internal power-on reset
• Programmable I/O with on-chip pull-ups
• Powerful table lookup and indirect addressing modes
• Fully static HALT mode with hardware restart capability
• Multi-Input Wakeup
• WATCHDOG timer
• 254 consecutive bytes of table lookup data in one block
• Multi-source interrupt (external interrupt with selectable edge, timer interrupt
• Schmitt trigger inputs
with selectable edge, and software interrupt)
COP8SAx7 APPLICATION IDEAS
4-39