T87C5101 查看數據表（PDF） - Temic Semiconductors
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T87C5101 Datasheet PDF : 52 Pages
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T87C5101
T83C5101/02
Table 2. Pin Description for 24 and 28 pin packages
MNEMONIC
PIN
NUMBER
24 28
pins pins
TYPE
NAME AND FUNCTION
VSS
VCC
P1.0-P1.7
P4.0 (Prog)-
P4.1 (Test)
P4.2-P4.5
P3.0-P3.7
Reset
VPP
XTAL1
XTAL2
12 14
24 28
13-20
15-20
22-23
7
8
8
9
NA
5-1
23-21
27
7
13
21
5-1
26-24
5
5
4
4
3
3
2
2
1
1
23 26
22 25
21 24
9
10
6
6
11 12
10 11
I
I
I/O
I/O
I
O (I)
O (I)
I/O
I/O
I
O
I
I
I
I
I/O
I/O
I
I
I
O
Ground: 0V reference
Power Supply: This is the power supply voltage for normal, idle and power-
down operation
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 4 bits 0 & 1: Except during programming and verifying, these two bits are
output port driving 30 micro Amps at high level and sinking 10 mA at low level
(Vol < 1V). If they have 1s written to them, they output a high level and if they
have 0 written to them, they output a low level. These 2 pins cannot be used as
inputs. Users should take care to never externally drive these pins low,
especially during reset. These two pins are primarily designed to drive LEDs.
During programming and verifying, these two pins are used as input, as explained
in the corresponding chapter.
A Read or a Read/Modify/Write instruction to these bits will read the status of
the output: 1 if the output is 1, 0 if the output is 0.
Port 4 bits 2 to 5: bidirectional I/O port with internal pull-ups. Port 4.2 to 4.5
pins that have 1s written to them are pulled high by the internal pull-ups and
can be used as inputs. As inputs, Port 4.2 to 4.5 pins that are externally pulled
low will source current because of the internal pull-ups.
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
INT1 (P3.3): External interrupt 1
T0 (P3.4): Timer 0 external input
T1 (P3.5): Timer 1 external input
No alternate function on this pin
No alternate function on this pin
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.
Programming Supply Voltage: This pin receives the 12.75V programming
supply voltage (VPP) during EPROM programming. During normal operation,
Vpp pin must be tied to Vcc.
Crystal 1: Input to the inverting oscillator amplifier and input to the internal
clock generator circuits.
Crystal 2: Output from the inverting oscillator amplifier
Rev. E - 29 February 2000
5
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