Z80189 Datasheet, PDF (101/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
SLEEP, HALT EFFECT ON MIMIC AND Z189 SIGNALS
The following Z80189 signals are driven high when Z180
MPU enters a Sleep or Halt State:
/ROMCS, /RAMCS always high in Sleep or Halt.
The following signals are high-Z during Sleep and Halt:
/IOCS1 when so selected in the Interrupt Edge/Pin Mux
Register.
/RD and /WR.
A0-A19 is always high-Z in power down.
D0-D7 always high-Z in power down modes.
HDRQ0, HDRQ1 are high-Z in HALT or Sleep.
Clock Generator
The Z80189 ZIP^™ uses the Z189 MPUs on-chip clock
generator to supply system clock. The required clock is
easily generated by connecting crystal to the external
terminals (XTAL, EXTAL).
RS, equivalent resistance:
≤ 60 Ohms
C = C = 15~22 pF.
IN
OUT
Recommended characteristics of the crystal and the val-
C1
ues for the capacitor are as follows (the values will change
XTAL
with crystal frequency).
Type of crystal:
Fundamental, parallel type crystal
(AT cut is recommended)
Crystal
Inputs
C2
EXTAL
Frequency tolerance:
Application dependent
CL, Load capacitance:
C =C =C
L
1
2
Approximately 22 pF
(acceptable range is 20-30 pF)
Figure 130. Circuit Configuration for Crystal
DS971890301
101