COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 228

• 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

The COP8SAC7 is the heart of the system that provides the processing power to scan the
keypad, service the receiver interrupts, update the real-time clock, serially communicate
with the display unit and data storage unit, and activate the auto-dialer unit. System
capabilities may be enhanced or scaled down by simply changing the processor’s
algorithm.
4.13.1 Typical Application Requirements
Keypad Scanning
The keyboard is organized as a matrix. The L port (Multi-Input Wakeup capability) is
configured as an input with weak pull-ups, and is used to sense the keypad inputs. Most
of the time the chip is in the current-saving HALT mode (Idd < 4 A). Any keystroke can
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 keypad is scanned in order to
detect which key is pressed. This event-driven keypad scanning technique results in
lowest possible current consumption because the HALT mode is used between successive
keystrokes.
Display Terminal Unit
The display terminal unit can interface with the COP8SAC7 through the software UART.
The COP8SAC7 is interrupted by the terminal and the microcontroller decodes the
character sent and services the corresponding request. The terminal keyboard can be
used to program the telephone numbers to be dialed by the auto-dialer unit. The real-
time clock is displayed on the terminal screen.
LCD Display Unit
The LCD display unit can be used to display the time and date information. The
microcontroller can communicate with the LCD display driver serially using the
MICROWIRE/PLUS serial interface.
4-36
• Powerful table lookup and indirect addressing modes
• Output pins have direct drive capability
• Fully static HALT mode with hardware restart capability
• WATCHDOG timer
• Programmable I/O
• 254 consecutive bytes of table lookup data in one block
• 10/14 multi-source vectored interrupts
• Schmitt trigger inputs
• LCD arithmetic instructions
COP8SAx7 APPLICATION IDEAS