Zilog Z8PE002 Manuel d'utilisateur télécharger pdf (Page 28)

Z8PE002

Z8Plus OTP Microcontroller ZiLOG

28 P R E L I M I N A R Y DS008700-Z8X0799

LC OSCILLATOR

The Z8Plus oscillator can use an inductor capacitor oscil-

lator (

LC) network to generate an XTAL clock (Figure 17).

The frequency stays stable over

and temperature. The

oscillation frequency is determined by the equation:

where

L is the total inductance including parasitics, and C

is the total series capacitance including parasitics.

Simple series capacitance is calculated using the equation

at the top of the next column.

A sample calculation of capacitance

and C

for 5.83-

MHz frequency and inductance value of 27 µH is displayed

as follows:

Thus,

= 55.2 pF and C

= 55.2 pF.

TIMERS

Two 8-bit timers, timer 0 (T0) and timer 1 (T1) are available

to function as a pair of independent 8-bit standard timers.

They may also be cascaded to function as a 16-bit Pulse-

Width Modulator (PWM) timer. Two additional 8-bit tim-

ers (

T2 and T3) are provided, but they can only operate as

one 16-bit standard timer.

Frequency =

2π (LC

)

1/2

1/ C

= 1/C

+ 1/C

If C

1/C

= 2/C

=2C

5.83 (10^6) =

2π [27 (10

-6

) C

]

1/2

= 27.6 pF

Figure 19. 16-Bit Standard Timer

Enable TCTLL0 (D5)

IRQ5 (T23)

16-bit Down Counter

Internal Data Bus

T2VALT3VAL

OSC/8

T3AR T2AR

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 47 48

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Zilog Z8PE002 Manuel d'utilisateur Page 28

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