Z86L81 Datasheet, PDF (27/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
21
Comparator Inputs
In analog mode, P31 and P32 have a comparator front end. The comparator refer-
ence is supplied to P33 and Pref1. In this mode, the P33 internal data latch and its
corresponding IRQ1 is diverted to the SMR sources (excluding P31, P32, and
P33) as indicated in Figure 8 on page 18. In digital mode, P33 is used as D3 of
the Port 3 input register, which then generates IRQ1.
Note: Comparators are powered down by entering Stop Mode. For
P31–P33 to be used in a Stop-Mode Recovery source, these
inputs must be placed into digital mode.
Comparator Outputs
These outputs can be programmed to be output on P34 and P37 through the
PCON register.
Functional Description
The Z86L81/86/98 incorporates special functions to enhance the Z8’s functionality
in consumer and battery-operated applications.
Program Memory
The Z86L81/86/98 family addresses 24/32/64 KB of internal program memory.
The first twelve bytes are reserved for interrupt vectors. These locations contain
the five 16-bit vectors, which correspond to the five available interrupts.
RAM
The Z86L81/86/98 device has 237 bytes of RAM, which make up the register file.
See Figure 10.
19-4615; Rev 0; 4/09