TS87C51RC2 ATMEL Corporation, TS87C51RC2 Datasheet - Page 6
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TS87C51RC2
Manufacturer Part Number
TS87C51RC2
Description
High Performance 8-bit Microcontroller 32 Kbytes Otp
Manufacturer
ATMEL Corporation
Datasheet
1.TS87C51RC2.pdf
(74 pages)
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TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
6
V
Vss1
V
P0.0-P0.7
P1.0-P1.7
P2.0-P2.7
P3.0-P3.7
SS
CC
Mnemonic
39-32
21-28
10-17
DIL
1-8
20
40
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
Pin Number
LCC VQFP 1.4
43-36
24-31
13-19
2-9
11,
22
44
11
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
37-30
40-44
18-25
7-13
1-3
16
39
38
40
41
42
43
44
45
46
47
10
11
12
13
5,
5
7
8
9
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
I
I
I
I
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
ECI (P1.2): External Clock for the PCA
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
CEX0 (P1.5): Capture/Compare External I/O for PCA module 2
CEX0 (P1.6): Capture/Compare External I/O for PCA module 3
CEX0 (P1.7): Capture/Compare External I/O for PCA module 4
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:
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.
RXD (P3.0): Serial input port
TXD (P3.1): Serial output port
INT0 (P3.2): External interrupt 0
INT1 (P3.3): External interrupt 1
T0 (P3.4): Timer 0 external input
T1 (P3.5): Timer 1 external input
WR (P3.6): External data memory write strobe
RD (P3.7): External data memory read strobe
Name And Function
Rev. C - 06 March, 2001