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參數(shù)資料
| 型號： | AT_8032 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-bit Embedded Microcontroller Core(8位嵌入式基于工業(yè)標準軟件兼容的微控制器) |
| 中文描述： | 8位嵌入式微控制器核心（8位嵌入式基于工業(yè)標準軟件兼容的微控制器） |
| 文件頁數(shù)： | 18/39頁 |
| 文件大小： | 532K |
| 代理商： | AT_8032 |
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AT_8032 Core
18
Figure 13.
External Program Memory Fetches
I/O Ports
All four ports of the AT_8032 macrocell contain an input
and an output. The output of Ports 0 and 2, and the input of
Port 0 are used for accessing external memory. When used
in this way, Port 0 outputs the low byte of the external
memory address, time-multiplexed with the byte being writ-
ten or read. Port 2 outputs the high byte of the external
memory address when the address is 16 bits wide. Other-
wise the Port 2 pins continue to emit the P2 SFR contents.
All the Port 3 pins and two Port 1 pins are multifunctional:
they also have several special features.
I/O Configurations
The port latch is a set of D-type flip-flops, which capture a
value from the internal bus in response to a
“
write to latch
”
signal from the microcontroller. The output of the flip-flops
is sent to the internal bus in response to a
“
read latch
”
sig-
nal sent by the microcontroller. It is the same for the level of
the port pin. Some instructions activate the
“
read latch
”
because they read a port; other instructions activate the
“
read pin
”
signal.
The output of Ports 0 and 2 can be switched between the
ADDR/DATA bus and the internal ADDR bus by an internal
control signal for use in external memory access. When
external memory is accessed, Port 2 SFR stays
unchanged, while Port 0 SFR has ones written to it.
Bi-directional Port Configuration
Each I/O line can be used separately as input or output. To
be used as input, the port bit latch has to contain a one; it
permits the output driver to be turned off. The pull-ups are
S1
P1
P2
S2
S3
S4
S5
S6
S1
S2
P1
P2 P1
P2 P1
P2 P1
P2 P1
P2 P1
P2 P1
P2
Oec.
(XTAL2)
ALE
PSEN
P0
Data Sampled
PCL
Out
Data Sampled
PCL
Out
PCL
Out
P2
PCH Out
PCH Out
Table 4.
I/O Port Alternate Functions
Port Pin
Alternate Function
P1.0
T2 (Timer/counter 2 external input)
P1.1
T2EX (Timer/counter 2 Capture/Reload
trigger)
P3.0
RXD (serial input port)
P3.1
TXD (serial output port)
P3.2
INT0 (external interrupt)
P3.3
INT1 (external interrupt)
P3.4
T0 (Timer/counter 0 external input)
P3.5
T1 (Timer/counter 1 external input)
P3.6
WR (external data memory write strobe)
P3.7
RD (external data memory read strobe)
Table 4.
I/O Port Alternate Functions (Continued)
Port Pin
Alternate Function
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