參數(shù)資料
型號(hào)： P87C766CBP
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Microcontrollers for PAL/SECAM TV with OSD and VST
中文描述： 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, PLASTIC, SDIP-42
文件頁(yè)數(shù)： 12/92頁(yè)
文件大?。?/td> 382K
代理商： P87C766CBP
1999 Mar 10
12
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
7
I/O FACILITY
7.1
I/O ports
The SDIP42 package has 28 I/O lines treated as
28 individual addressable bits or as 3 parallel 8-bit
addressable ports (Ports 0, 1 and 5) and one 4-bit port
(Port 3).
When these 28 I/O lines are used as input ports, the
corresponding bits in SFRs P0, P1, P3 and P5 should be
set to a logic 1 to facilitate the external input signal.
Ports 1, 3 and 5 also perform the following alternative
functions.
Port 1.
Used for a number of special functions:
Provides the external interrupt inputs (INT0 and INT1)
Provides the 16-bit timer/counter inputs (T0 and T1)
Provides the I
2
C-bus data and clock signals (SDA and
SCL)
P1.0 and P1.7 can be used as external interrupt inputs.
Port 3
. Only 4 lines available for alternative functions:
7-bit PWM output (PWM7)
ADC inputs ADC0 to ADC2.
Port 5.
Provides the 14-bit PWM output (TPWM)
7-bit PWMs outputs (PWM0 to PWM6).
To enable the alternative functions of Ports 1, 3 and 5, the
port bit latch of its associated SFR must contain a logic 1.
Each port consists of a latch (SFRs P0, P1, P3 and P5), an
output driver and an input buffer.
7.2
Port configurations
1.
Open-drain quasi-bidirectional I/O with n-channel
pull-down (see Fig.6). Use as an output requires the
connection of an external pull-up resistor. Use as an
input requires to write a logic 1 to the port latch before
reading the port line.
Push-pull; gives drive capability of the output in both
polarities, see Fig.7.
2.
Fig.6 Open-drain port.
handbook, halfpage
MGK547
n
Q
from port latch
input data
read port pin
INPUT
BUFFER
I/O pin
Fig.7 Push-pull port.
handbook, halfpage
MGM679
p1
n
strong pull-up
+
5 V
Q
from port latch
output pin
相關(guān)PDF資料
PDF描述
P87C766 Microcontrollers for PAL/SECAM TV with OSD and VST
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