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TS80C51U2 Datasheet(PDF) 6 Page - ATMEL Corporation

No. de pieza TS80C51U2
Descripción Electrónicos  Double UART 8-bit CMOS Microcontroller
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

TS80C51U2 Datasheet(HTML) 6 Page - ATMEL Corporation

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6
Rev. D - 15 January, 2001
TS80C51U2
TS83C51U2
TS87C51U2
Table 3. Pin Description for 40/44 pin packages
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 TSC8x54/58 Port 1 include:
1
2
40
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout
2
3
41
I
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
3
4
7
8
4
5
8
9
42
43
2
3
I
O
I
O
Depending on values of (M1UA_1, M0UA_1) bits located into AUXR register,
the UART_1 pins are alternate functins of P1 with two possible locations.
First location:
P1.2: RxD_1, serial input port for UART_1
P1.3: TxD_1, serial output port for UART_1
Second location:
P1.6: RxD_1, serial input port for UART_1
P1.7: TxD_1, serial output port for UART_1
See “Alternate function on Port 1” on page 32
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 receive the high order address bits during EPROM programming
and verification: P2.0 to P2.5
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. Port 3 also serves the special
features of the 80C51 family, as listed below.
10
11
5
I
RxD_0 (P3.0): Serial input port for UART_0
11
13
7
O
TxD_0 (P3.1): Serial output port for UART_0
12
14
8
I
INT0 (P3.2): External interrupt 0
13
15
9
I
INT1 (P3.3): External interrupt 1
14
16
10
I
T0 (P3.4): Timer 0 external input
15
17
11
I
T1 (P3.5): Timer 1 external input
16
18
12
O
WR (P3.6): External data memory write strobe
17
19
13
O
RD (P3.7): External data memory read strobe


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