Z86D86 Datasheet, PDF (24/80 Pages) Zilog, Inc. – 28-Pin Low-Voltage OTP Microcontroller

Z86D86
28-Pin Low-Voltage OTP Microcontroller
16
T16 Common Control Register” on page 39). Other edge-detect and IRQ modes
are described in Table 7.
Table 7. Pin Assignments
Pin
Pref1
P31
P32
P33
P34
P35
P36
P37
P20
I/O
IN
IN
IN
OUT
OUT
OUT
OUT
I/O
C/T
IN
T8
T16
T8/16
IN
Comp.
RF1
AN1
AN2
RF2
AO1
AO2
Int.
IRQ2
IRQ0
IRQ1
Port 3 also provides output for the counter/timers and the AND/OR logic. Control
is performed by programming bits D5–D4 of CTR1 and bit 0 of CTR2.
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 are diverted to the SMR sources (excluding P31, P32, and
P33) as indicated in Figure 8 on page 15. 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 output on P34 and P37 through the PCON
register (Figure 9).
PS008905-0105
PRELIMINARY