TS87C52X2 ATMEL Corporation, TS87C52X2 Datasheet - Page 6
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TS87C52X2
Manufacturer Part Number
TS87C52X2
Description
8-bit Microcontroller 8 Kbytes Otp
Manufacturer
ATMEL Corporation
Datasheet
1.TS87C52X2.pdf
(54 pages)
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6
TS8xCx2X2
V
Vss1
V
P0.0-P0.7
P1.0-P1.7
P2.0-P2.7
P3.0-P3.7
Mnemonic
SS
CC
DIL
39-
1-8
21-
10-
20
40
32
28
17
10
11
12
1
2
Pin Number
LCC
43-
2-9
24-
13-
11,
22
44
36
31
19
11
13
14
1
2
3
VQFP
37-30
40-44
18-25
7-13
1.4
1-3
16
39
38
40
41
5,
5
7
8
Type Name and Function
I/O
I/O
I/O
I/O
I/O
O
I
I
I
I
I
I
Ground: 0V reference
Optional Ground: Contact the Sales Office for ground
connection.
Power Supply: This is the power supply voltage for normal,
idle and power-down operation
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.
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:
T2 (P1.0): Timer/Counter 2 external count input/Clockout
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction
Control
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 atDPTR).In this application, it
uses strong internal pull-ups emitting 1s. During accesses to
external data memory that use 8-bit addresses (MOVX atRi),
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 P2.4
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.
RXD (P3.0): Serial input port
TXD (P3.1): Serial output port
INT0 (P3.2): External interrupt 0
4184E–8051–09/02