ZiLOG
Z8E001
Z8Plus OTP Microcontroller
LC OSCILLATOR
The Z8E001 oscillator can use a LC network to generate a
XTAL clock (Figure 17).
The frequency stays stable over VCC and temperature. The
oscillation frequency is determined by the equation:
Frequency =
1
2π (LCT) 1/2
where L is the total inductance including parasitics, and CT
is the total series capacitance including parasitics.
Simple series capacitance is calculated using the equation
at the top of the next column.
1/ CT = 1/C1 + 1/C2
If C1 =
C2
1/CT =
C1 =
2 C1
2CT
A sample calculation of capacitance C1 and C2 for 5.83
MHz frequency and inductance value of 27 µH is displayed
as follows:
5.83 (10^6) =
1
2¹ [2.7 (10-6) CT] º
CT = 27.6 pF
Thus C1 = 55.2 pF and C2 = 55.2 pF.
TIMERS
For the Z8E001, 8-bit timers (T0 and T1) are available to
function as a pair of independent 8-bit standard timers, or
they can be cascaded to function as a 16-bit PWM timer.
In addition to T0 and T1, extra 8-bit timers (T2 and T3) are
provided, but they can only operate in cascade to function
as a 16-bit standard timer.
OSC/8
Enable TCTLL0 (D5)
16-bit Down Counter
IRQ5 (T23)
T3VAL
T3AR
T2AR
T2VAL
Internal Data Bus
Figure 19. Z8E001 16-Bit Standard Timer
DS001101-Z8X0400
PRELIMINARY
25