Z86L02 datasheet(25/37 Pages) ZILOG

25 / 37 page

Z86C02/E02/L02

Zilog

Cost Effective, 512-Byte ROM CMOS Z8® Microcontrollers

DS96DZ80301

P R E L I M I N A R Y

Options

The Z86C02/E02/L02 offers ROM protect, Low Noise,

Auto Latch Disable, RC Oscillator, and Permanent WDT

enable features as options. The Z86E02 must be power

cycled to fully implement the selected option after pro-

gramming.

Low Noise. The Z8 can operate in a low EMI emission

mode by selecting the low noise option. Use of this feature

will result in:

All drivers slew rates are reduced to 10 ns (typical).

Internal SCLK/TCLK = XTAL operation is limited to a

maximum of 4 MHz - 250 ns cycle time.

Output drivers have resistances of 200 ohms (typical).

Oscillator divide-by-two circuitry is eliminated.

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.)

EPROM/TEST MODE Disable. When selected, this bit will

permanently disable EPROM and Factory Test mode.

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 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.

EPROM Mode Description. In addition to VDD and GND

(VSS), the Z8 changes all its pin functions in the EPROM

mode. XTAL2 has no function, XTAL1 functions as /CE,

P31 functions as /OE, P32 functions as EPM, P33 func-

tions as VPP, and P02 functions as /PGM.

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.

User Modes. Table 6 shows the programming voltage of

each mode of Z86E02.

Figure 18. 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

Z86E02

Z86L02

Z86C02

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