W921E880A/W921C880
DTMF Generator and 8-bit D/A Converter
• One Channel DTMF Generator
• One Channel 8-bit D/A Converter
Voltage Comparator
• Four by one Channel Voltage Comparator
Serial I/O Interface
• Clock Synchronous multi-nibbles Serial Transmitter/Receiver Interface
Stack
• 8-bit Stack Pointer
Address Mode
• ROM: Indirect call addressing mode
Long jump/call addressing mode
• RAM: Direct addressing mode
Indirect addressing mode
Working reg. addressing mode
• Look-up table addressing mode
Instruction Sets
• 117 Instruction sets
Operating Voltage
• 2.8 to 5.5V operating voltage for W921E880A EPROM Type
• 2.4 to 5.5V operating voltage for W921C880 Mask ROM Type
Package Type
• Packaged in 80-pin QFP
Publication Release Date: July 1999
-5-
Revision A3