Z86L0808PSC datasheet(21/26 Pages) ZILOG

21 / 26 page

Z86L04/L08

Zilog

Z8 8-Bit Cost-Effective Microcontrollers

DS97LVO0901

P R E L I M I N A R Y

OPTIONS

ROM protect, Low Noise, Auto Latch Disable, RC Oscilla-

tor, 32 kHz Crystal and Permanent WDT enable features

as options and must be selected at the time of ROM code

submissions.

ROM Protect. ROM Protect fully protects the Z8 ROM

code from being read externally. When ROM Protect is se-

lected, the instructions LDC and LDCI are supported.

(However, instructions LDE and LDEI are not supported.)

Auto Latch Disable. Auto Latch Disable option when Se-

lected will globally disable all Auto Latches.

RC. RC Oscillator option when selected will allow using a

resistor (R) and a capacitor (C) as a clock source.

WDT Clock Source. This selects the clock source of the

WDT and POR counter chain to be driven by either the in-

ternal system clock or the internal on-board RC oscillator.

(Z86L04 only).

Low EMI. The Low EMI (Low noise) mode by passes the

divide by two clock circuit (SCLK = XTAL/1) and lowers the

output sink and drive currents by 75 percent. The maxi-

mum oscillator frequency at XTAL pins is 1MHz.

WDT Enable. WDT Enable option bit when selected will

have the WDT permanently enabled in all modes and can

not be stopped in HALT or STOP Mode, if the internal RC

oscillator is selected as the clock source. If the system

clock (SCLK) is the clock source, the WDT will be stopped

in STOP mode.

Please note that when using the device in a noisy environ-

ment, it is suggested that the voltages on the EPM and CE

pins be clamped to VCC through a diode to VCC to prevent

accidentally entering the OTP mode. The VPP requires

both a diode and a 100 pF capacitor.

32 kHz Crystal. This disables the internal feedback resis-

tor on the crystal oscillator circuit (not for RC oscillator cir-

cuit) so that a 32 kHz crystal can be connected to the

XTAL1 and XTAL2 pins.

Figure 17. Typical Auto Reset Voltage (VLV) vs. Temperature

2.6

2.7

2.8

2.9

3.0

3.2

Vcc

(Volts)

–40

°C

Temp

2.5

–20

°C0°C20°C

°C80°C

100

°C

3.1

1.8

1.9

2.0

2.1

2.2

2.4

1.7

2.3

1.6

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