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| 型號： | Z86L75 |
| 廠商： | ZiLOG, Inc. |
| 英文描述： | IR/Low-Voltage Microcontroller |
| 中文描述： | 紅外/低電壓微控制器 |
| 文件頁數(shù)： | 16/61頁 |
| 文件大?。?/td> | 349K |
| 代理商： | Z86L75 |
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Z86L70/71/75/C71
IR/Low-Voltage Microcontroller
Zilog
1-16
P R E L I M I N A R Y
DS97LVO0500
PIN FUNCTIONS
(Continued)
Port 3
(P36-P31). Port 3 is a 6-bit, CMOS-compatible
three fixed input and three fixed output port. Port 3 consists
of three fixed input (P33-P31) and three fixed output (P36-
P34), and can be configured under software control for In-
put/Output, Interrupt, and output from the counter/timers.
P31, P32, and P33 are standard CMOS inputs; outputs are
push-pull, except for P34, P35 which have floating drain
capability (controlled by P3M, D0).
Two on-board comparators process analog signals on P31
and P32 with reference to the voltage on P33. The analog
function is enabled by programming the Port 3 Mode Reg-
ister (bit 1). P31 and P32 are programmable as rising, fall-
ing, or both edge triggered interrupts (IRQ register bits 6
and 7). Pref1 and P33 are the comparator reference volt-
age inputs. Access to the Counter Timer edge detection
circuit is through P31 or P20 (see CTR1 description).
Port 3 provides the following control functions: three exter-
nal interrupt request signals (IRQ2-IRQ0).
Port 3 also provides output for each of the counter/timers
and the AND/OR Logic. Control is performed by program-
ming bits D5-D4 of CTRI, bit 0 of CTR0 and bit 0 of CTR2.
Table 2. Pin Assignments
Pin
P31
P32
P33
P34
P35
P36
P20
I/O
IN
IN
IN
OUT
OUT
OUT
I/O
C/T
IN
Comp.
AN1
AN2
V
REF
A01
Int.
IRQ2
IRQ0
IRQ1
Ext
T8
T16
T8/16
IN
DM
Figure 10. Port 3 Configuration
P34 OUT
P32
+
-
P33
0 = P34 Standard Output
1 = P34 Comparator Output
PCON
D0
P31
+
-
P33
P34
PAD
*
T8
P34 OUT
0 Normal Control
1 8-bit Timer output active
CTR0
D0
Counter/Timer
Reset condition.
*
Comp1
Comp2
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