GENERAL DESCRIPTION
The Z80189/Z8L189 are cost-effective modem controllers that address a new generation of data pumps having the HDLC formatting feature. Data pumps of these types do not require an HDLC interface; therefore, the Z80189 does not need the ESCC™. The addition of the PC DMA Mailbox Registers allow DMA data transfer between the PC memory and the modem speaker/microphone CODEC. The Z80189 is a smart peripheral controller chip for modem (in particular V.34 applications), fax, voice messaging, and other communications applications.
   
FEATURES   
■ Fully Static Z180™ MPU Core*
    – On-Chip 1 MByte MMU
    – Two Enhanced UART Channels (up to 512 Kbps)†
    – Two Chain-Linked DMA Channels†
    – x 2 Clock Multiplier
    – Low-Power Consumption Modes
    – Two 16-Bit Timer/Counters
    – Clocked Serial I/O
    – On-Chip Wait State Generator (WSG)
    – On-Chip Interrupt Controller
    – On-Chip Clock Oscillator/Generator
■ 16550 Compatible MIMIC Interface
    – 16 mA MIMIC Output Drive Capability   
■ Com Port Decode
■ PC DMA Mailbox Registers
■ Host I/O Mailbox
■ Programmable Fixed /ROMCS and
    /RAMCS Boundaries
■ 100-Pin QFP and VQFP Packages
■ 3.3 and 5.0-Volt Operating Ranges
■ 0°C to +70°C Temperature Range