Z80189 Datasheet, PDF (63/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
Z80189 MAILBOX REGISTER MAP
Register Name
Host I/O Status Register
Host Output Register 1
Host Input Register 1
Host Output Register 0
Host DMA Mailbox Cntrl Reg
Host DMA Transmit Register 1
Host DMA Receive Register 1
Host DMA Transmit Register 0
Host DMA Receive Register 0
MPU Addr/Access
%XXD5 W bit 1/R
%XXD4 R
%XXD4 W
%XXD3 R
%XXD2 R/W
%XXD1 R
%XXD1 W
%XXD0 R (1)
%XXD0 W
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
PC Addr/Access
Prog + 10b R (2)
Prog + 01b W (2)
Prog + 01b R (2)
Prog + 00b W (2)
None
DMA1 W (3)
DMA1 R
DMA0 W
DMA0 R
1. This register is defaulted to 91h to indicate revision code.
(Z189 revision #1 - Z80189AA)
2. The PC Host Addresses are HA9:2 are programmable by writing to PADATA.
3. The HDMAT1 can be used as an extra host output mailbox register. If the Host DMA Mailbox 1 function is disabled
(bit 1 of HMC register is zero), a Host write in the programmed Mailbox range with HA1, 0=1,1 will cause the host data
to be latched into the HDMAT1 register.
Note: All register addresses not listed are Reserved.
DS971890301
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