Z86L81 Datasheet, PDF (57/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
51
Table 15. IRQ Register* (Continued)
IRQ
Interrupt Edge
1
1
R/F
R/F
Notes:
F = Falling Edge
R = Rising Edge
*In stop mode, the comparators are turned off.
Clock
The Z86L81/86/98 on-chip oscillator has a high-gain, parallel-resonant amplifier,
for connection to a crystal, LC, ceramic resonator, or any suitable external clock
source (XTAL1 = Input, XTAL2 = Output). The crystal must be AT cut, 1 MHz to 8
MHz maximum, with a series resistance (RS) less than or equal to 100 Ohms. The
Z86LXX on-chip oscillator can be driven with a low-cost RC network or other suit-
able external clock source.
For 32-kHz crystal operation, both an external feedback (Rf) and serial resistor
(Rd) are required. See Figure 27.
The crystal must be connected across XTAL1 and XTAL2 using the recommended
capacitors (capacitance greater than or equal to 22 pF) from each pin to ground.
The RC oscillator configuration is an external resistor connected from XTAL1 to
XTAL2, with a frequency-setting capacitor from XTAL1 to ground (Figure 27).
19-4615; Rev 0; 4/09