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參數(shù)資料
| 型號： | P83C370 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for NTSC TVs with On-Screen Display (OSD) and Closed Caption (CC)(在NTSC TV中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點的微控制器) |
| 中文描述： | 微控制器用于NTSC電視的屏幕顯示（OSD）和字幕（CC）的（在NTSC電視中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點的微控制器） |
| 文件頁數(shù)： | 29/80頁 |
| 文件大小： | 266K |
| 代理商： | P83C370 |
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1999 Jun 11
29
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
14 PIN FUNCTION SELECTION
Ports 0, 1 and 3 are dual purpose ports and can be
configured as port lines or selected as alternative
functions. Selection of the pin as a port line or alternative
function is achieved using the appropriate SFR as
described in Sections 14.1, 14.2.1 and 14.3.
14.1
Port 0 pin function selection
Port 0 is an 8-bit port which can be configured as eight
bidirectional port lines (P0.0 to P0.7) or as eight 7-bit PWM
outputs (PWM1 to PWM8).
Each 7-bit PWM output can be selected by setting the
PWMnE bit in its associated PWMn register to a logic 1
(see Section 15.1). When using these pins as PWM
outputs, the system software needs to keep track of its I/O
status and avoid reading from these ports.
When using these pins as general I/O port lines
(PWMnE = 0), writing is done to the P0 latch and reading
at either the P0 latch or the port pins. No special control is
required for this selection.
14.2
Port 1, P3.4 and P3.5 pin function selection
Port 1 is a 4-bit port which can be configured as four
bidirectional port lines (P1.0 to P1.3) or as three AFT
inputs (AFT0 to AFT2) and one 7-bit PWM output
(PWM0).
The AFT inputs are selected using the Port 1 Selection
Register (P1SEL) as described in Section 14.2.1. This
register also selects the I
2
C-bus functions of P3.4 and
P3.5. The PWM function of the P1.3/PWM0 pin is enabled
by setting the PWM0E bit in SFR PWM0 to a logic 1.
14.2.1
P
ORT
1 S
ELECTION
R
EGISTER
(P1SEL)
Table 35
Port 1 Selection Register (SFR address F4H)
Table 36
Description of P1SEL bits
7
6
5
4
3
2
1
0
I
2
CE
AFT2E
AFT1E
AFT0E
BIT
SYMBOL
I
2
CE
DESCRIPTION
7
6
5
4
These 3 bits are reserved.
When I
2
CE = 1, pins 49 and 50 are enabled as alternative functions SCL and SDA
respectively. When I
2
CE = 0, pins 49 and 50 are enabled as general I/O port lines P3.4
and P3.5 respectively.
This bit is not used.
When AFT2E = 1, pin 11 is selected as AFT2 input. When AFT2E = 0, pin 11 is selected
as general I/O port line P1.2.
When AFT1E = 1, pin 10 is selected as AFT1 input. When AFT1E = 0, pin 10 is
selected as general I/O port line P1.1.
When AFT0E = 1, pin 9 is selected as AFT0 input. When AFT0E = 0, pin 9 is selected
as general I/O port line P1.0.
3
2
AFT2E
1
AFT1E
0
AFT0E
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