Z86D7308HSC datasheet(30/92 Pages) ZILOG

30 / 92 page

Z86D73

40/44/48-Pin Low-Voltage IR OTP

PS019402-1103

Two on-board comparators process analog signals on P31 and P32, with refer-

ence to the voltage on Pref1 and P33. The analog function is enabled by program-

ming the Port 3 Mode Register (bit 1). P31 and P32 are programmable as rising,

falling, or both edge triggered interrupts (IRQ register bits 6 and 7). Pref1 and P33

are the comparator reference voltage inputs. Access to the Counter Timer edge-

detection circuit is through P31 or P20 (see “CTR1(D)01h” on page 37). Other

edge detect and IRQ modes are described in Table 9.

Comparators are powered down by entering STOP Mode. For

P31–P33 to be used in a Stop-Mode Recovery (SMR) source,

these inputs must be placed into digital mode.

Port 3 also provides output for each of the counter/timers and the AND/OR Logic

(see Figure 14). Control is performed by programming bits D5–D4 of CTR1, bit 0

of CTR0, and bit 0 of CTR2.

Table 9. Pin Assignments

I/O

C/T

Comp.

Int.

Pref1

RF1

P31

AN1

IRQ2

P32

AN2

IRQ0

P33

RF2

IRQ1

P34

OUT

AO1

P35

OUT

T16

P36

OUT

T8/16

P37

OUT

AO2

P20

I/O

Note:

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