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參數(shù)資料
| 型號： | Z86C34 |
| 廠商： | ZiLOG, Inc. |
| 英文描述： | CMOS Z8 MCU(CMOS Z8系列微控制器) |
| 中文描述： | 單片機(jī)的CMOS Z8的CMOS（Z8系列微控制器） |
| 文件頁數(shù)： | 26/70頁 |
| 文件大?。?/td> | 1192K |
| 代理商： | Z86C34 |
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Z86C34/C35/C36/C44/C45/C46
CMOS Z8 MCUs with ASCI UART
ZiLOG
26
P R E L I M I N A R Y
DS007601-Z8X0499
PIN FUNCTIONS
(Continued)
Port 3 (P37–P30).
Port 3 is an 8-bit, CMOS-compatible
port, with four fixed inputs (
P33–P30
) and four fixed out-
puts (
P34–P37
). It is configured under software control for
Input/Output, Counter/Timers, interrupt, port handshake,
and Data Memory functions. Port 3, bit
0
input is Schmitt-
triggered, and pins
P31
,
P32
, and
P33
are standard CMOS
inputs (no Auto Latches). Pins
P34
,
P35
,
P36
,
P37
are push-
pull output lines. Low-EMI output buffers can be globally
programmed by the software.
Two onboard comparators can process analog signals on
P31
and
P32
with reference to the voltage on
P33
. The an-
alog function is enabled by programming Port 3 Mode Reg-
ister (
P3M
bit
1
). For Interrupt functions, Port 3, bit
0
and
pin
3
are falling edge interrupt inputs.
P31
and
P32
are pro-
grammable as rising, falling, or both edge triggered inter-
rupts (
IRQ
register Bits
6
and
7
).
P33
is the comparator ref-
erence voltage input when in Analog mode. Access to
Counter/Timers 1 is made through
P31
(
T
IN
) and
P36
(
T
OUT
). Handshake lines for Ports 0, 1, and 2 are available
on
P31
through
P36
.
Port 3 also provides the following control functions: hand-
shake for Ports 0, 1, and 2 (
DAV
and
RDY
); four external
interrupt request signals (
IRQ3–IRQ0
); timer input and out-
put signals (
T
IN
and
T
OUT
); Data Memory Select (
DM
, see
Table 10 and Figure 15).
P34
output can be software-programmed to function as a
Data Memory Select (
DM
). The Port 3 mode register (
P3M
)
Bit
D3
,
D4
selects this function. When accessing external
Data Memory, the
P34
goes active Low; when accessing
external Program Memory, the
P34
goes High.
An onboard UART (ASCI) can be enabled by software by
setting the
RE
and
TE
bits of the ASCI Control Register A
(
CNTLA
). When enabled,
P30
is the receive input and
P37
is the transmit output.
Comparator Inputs and Outputs.
Port 3, pins
P31
and
P32
each feature a comparator front end. The comparator
reference voltage, pin
P33
, is common to both comparators.
In analog mode, the
P31
and
P32
are the positive inputs to
the comparators and
P33
is the reference voltage supplied
to both comparators. In digital mode, pin
P33
can be used
as a
P33
register input or
IRQ1
source.
P34
and
P37
outputs
the comparator outputs by software-programming the
PCON
Register Bit
D0
to
1
(see Figure 16).
Note:
The user must add a two-
NOP
delay after selecting the
P3M
bit
D1
to
1
before the comparator output is valid.
IRQ0
,
IRQ1
, and
IRQ2
should be cleared in the IRQ reg-
ister when the comparator is enabled or disabled.
Table 10. Port 3 Pin Assignments
Pin
I/O
CTC1
Analog
Int.
P0 HS
P1 HS
P2 HS
Ext
UART
P30
P31
P32
P33
P34
P35
P36
P37
IN
IN
IN
IN
IRQ3
IRQ2
IRQ0
IRQ1
RX
T
IN
AN1
AN2
REF
D/R
D/R
D/R
R/D
OUT
OUT
OUT
OUT
AN1–OUT
DM
R/D
T
OUT
R/D
AN2–OUT
TX
Notes:
HS = Handshake Signals
D = DAV
R = RDY
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