Z80189 データシートの表示（PDF） - Zilog

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Z80189

GENERAL-PURPOSE EMBEDDED CONTROLLERS

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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

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