TS87C54X2-LCA Ver la hoja de datos (PDF) - Atmel Corporation
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TS87C54X2-LCA Datasheet PDF : 58 Pages
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TS80C54X2/C58X2
TS87C54X2/C58X2
Table 3. Pin Description for 40/44 pin packages
PIN NUMBER
MNEMONIC
TYPE
DIL LCC VQFP 1.4
NAME AND FUNCTION
VSS
Vss1
VCC
P0.0-P0.7
P1.0-P1.7
P2.0-P2.7
P3.0-P3.7
Reset
20 22
1
40 44
39-32 43-36
16
39
38
37-30
1-8 2-9
40-44
1-3
1
2
21-28
2
3
24-31
40
41
18-25
10-17 11,
5,
13-19
7-13
10 11
5
11 13
7
12 14
8
13 15
9
14 16
10
15 17
11
16 18
12
17 19
13
9
10
4
I Ground: 0V reference
I Optional Ground: Contact the Sales Office for ground connection.
I
Power Supply: This is the power supply voltage for normal, idle and power-
down operation
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.
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:
I/O T2 (P1.0): Timer/Counter 2 external count input/Clockout
I T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
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 for A8 to A13
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 pin P3.4 receive
the high order address bits during EPROM programming and verification for
TS8xC58X2 devices.
Port 3 also serves the special features of the 80C51 family, as listed below.
I RXD (P3.0): Serial input port
O TXD (P3.1): Serial output port
I INT0 (P3.2): External interrupt 0
I INT1 (P3.3): External interrupt 1
I T0 (P3.4): Timer 0 external input
I T1 (P3.5): Timer 1 external input
O WR (P3.6): External data memory write strobe
O RD (P3.7): External data memory read strobe
P3.4 also receives A14 during TS87C58X2 EPROM Programming.
I Reset: A high on this pin for two machine cycles while the oscillator is running,
resets the device. An internal diffused resistor to VSS permits a power-on reset
using only an external capacitor to VCC.
Rev. C - 15 January, 2001
5
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