Z86L827HZ008SC View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z86L827HZ008SC

20-Pin Low-Voltage IR Microcontrollers

Zilog 

Z86L825/826/827

20-Pin Low-Voltage IR Microcontrollers

56

For 32-kHz crystal operation, an external feedback resistor (Rf) and a serial resis-

tor (Rd) are required. See Figure 44.

XTAL1

C1

XTAL2

C2

XTAL1

C1

L

XTAL2

C2

XTAL1

C1

R

XTAL2

Ceramic Resonator or Crystal

C1, C2 = 47pF TYP*

f = 8 MHz

XTAL1

C1

Rf

LC

C1, C2 = 22 pF

L = 130 µH*

f = 3 MHz*

RC

@ 3V VCC (TYP)

C1 = 33 pF*

R = 1K*

XTAL1

C2 Rd

XTAL2

32 kHz XTAL

C1 = 20 pF, C = 33 pF

Rd = 56–470K

Rf = 10M

Figure 44. Oscillator Configuration

XTAL2

External Clock

The crystal needs to be connected across XTAL1 and XTAL2 using the recom-

mended capacitors (capacitance greater than or equal to 22 pF) from each pin to

ground. The RC oscillator configuration is an external resistor connected from

XTAL1 to XTAL2, with a frequency-setting capacitor from XTAL1 to ground (see

Figure 44).

Power-On Reset (POR)

A timer circuit clocked by a dedicated on-board RC oscillator is used for the

Power-On Reset (POR) timer function. The POR time allows VCC and the oscilla-

tor circuit to stabilize before instruction execution begins.

The POR timer circuit is a one-shot timer triggered by one of three conditions:

• Power Fail to Power OK status including Waking up from VBO Standby

• Stop-Mode Recovery (if D5 of SMR = 1)

• WDT Time-Out

PS008808-1203

PRELIMINARY

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