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TS87C51RC2-MIE Arkusz danych(PDF) 7 Page - ATMEL Corporation

Numer części TS87C51RC2-MIE
Szczegółowy opis  High Performance 8-bit Microcontroller
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

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TS8xC51Rx2
4188A–8051–10/02
Mnemonic
Pin Number
Type
Name And Function
DIL
LCC
VQFP 1.4
VSS
20
22
16
I
Ground: 0V reference
Vss1
1
39
I
Optional Ground: Contact the Sales Office for ground connection.
VCC
40
44
38
I
Power Supply: This is the power supply voltage for normal, idle and power-down
operation
P0.0-P0.7
39-32
43-36
37-30
I/O
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to
them float and can be used as high impedance inputs. Port 0 pins must be polarized to
Vcc or Vss in order to prevent any parasitic current consumption. Port 0 is also the
multiplexed low-order address and data bus during access to external program and
data memory. In this application, it uses strong internal pull-up when emitting 1s. Port 0
also inputs the code bytes during EPROM programming. External pull-ups are required
during program verification during which P0 outputs the code bytes.
P1.0-P1.7
1-8
2-9
40-44
1-3
I/O
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 pins that
have 1s written to them are pulled high by the internal pull-ups and can be used as
inputs. As inputs, Port 1 pins that are externally pulled low will source current because
of the internal pull-ups. Port 1 also receives the low-order address byte during memory
programming and verification.
Alternate functions for Port 1 include:
1
2
40
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout
23
41
I
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
34
42
I
ECI (P1.2): External Clock for the PCA
4
5
43
I/O
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
5
6
44
I/O
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
6
7
45
I/O
CEX0 (P1.5): Capture/Compare External I/O for PCA module 2
7
8
46
I/O
CEX0 (P1.6): Capture/Compare External I/O for PCA module 3
8
9
47
I/O
CEX0 (P1.7): Capture/Compare External I/O for PCA module 4
P2.0-P2.7
21-28
24-31
18-25
I/O
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that
have 1s written to them are pulled high by the internal pull-ups and can be used as
inputs. As inputs, Port 2 pins that are externally pulled low will source current because
of the internal pull-ups. Port 2 emits the high-order address byte during fetches from
external program memory and during accesses to external data memory that use 16-
bit addresses (MOVX @DPTR).In this application, it uses strong internal pull-ups
emitting 1s. During accesses to external data memory that use 8-bit addresses (MOVX
@Ri), port 2 emits the contents of the P2 SFR. Some Port 2 pins (P2.0 to P2.5) receive
the high order address bits during EPROM programming and verification:
P3.0-P3.7
10-17
11,
13-19
5,
7-13
I/O
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that
have 1s written to them are pulled high by the internal pull-ups and can be used as
inputs. As inputs, Port 3 pins that are externally pulled low will source current because
of the internal pull-ups. Some Port 3 pins (P3.4 to P3.5) receive the high order address
bits during EPROM programming and verification.
Port 3 also serves the special features of the 80C51 family, as listed below.
10
11
5
I
RXD (P3.0): Serial input port
11
13
7
O
TXD (P3.1): Serial output port
12
14
8
I
INT0 (P3.2): External interrupt 0
13
15
9
I
INT1 (P3.3): External interrupt 1


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