Z86D990 Datasheet, PDF (97/102 Pages) Zilog, Inc. – Low-Voltage Micro controllers with ADC

Z86D990/Z86D991 OTP and Z86L99X ROM
Low-Voltage Microcontrollers with ADC
90
the ADC input mode, the switching capacitor starts to charge up from 0 V. For the
maximum swing (Dout = 0 to FF), it takes 2/(0.0021x f ADC). For an 8-MHz MCU
crystal (with clock divide-by-two mode), the internal system clock is 4 MHz. In
ADCCTRL, if you select the ADC frequency = system clock divided by 1 option,
f ADC = 4 MHz. The step response = 238 uS.
AC Characteristics
Table 57 lists the AC characteristics.
Table 57. AC Characteristics
No. Symbol Parameter
VDD
1 TpC
Input Clock Period
2.3 V
5.5 V
2 TrC, TfC
Clock Input Rise and Fall Times 2.3 V
5.5 V
3 TwC
Input Clock Width
2.3 V
5.5 V
4 TwTinL
Timer Input Low Width
2.3 V
5.5 V
5 TwTinH
Timer Input High Width
2.3 V
5.5 V
6 TpT1in
Timer 1 Input Period
2.3 V
5.5 V
7 TrTin, TfTin Timer Input Rise and Fall Time
2.3 V
5.5 V
8 TwIL
Interrupt Request Low Time
2.3 V
5.5 V
9 TwIH
Interrupt Request Input High Time 2.3 V
5.5 V
10 Twsm
Stop-Mode Recovery Width Spec 2.3 V
5.5 V
12 Twdt
Watch-Dog Timer Time Out
2.3 V
5.5 V
Min
120
120
5.0
5.0
2TPC
2TPC
2
2
8
8
100
70
5
5
12
12
25
10
Max
DC
DC
25 ns
25 ns
100
100
Units
ns
ns
ns
ns
TpC
TpC
TpC
TpC
ns
ns
ns
ns
TpC
TpC
ns
ns
ms
ms
PS003807-1002
PRELIMINARY