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參數(shù)資料
| 型號(hào)： | BN87C51BH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 842K |
| 代理商： | BN87C51BH |
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AUTOMOTIVE 80C31BH/80C51BH/87C51
Diagrams are for pin reference only. Package sizes are not to scale.
270419±3
Pin (PDIP)
EPROM only
Do not connect reserved pins
270419±4
Pad (PLCC)
Figure 3. Pin Connections
PIN DESCRIPTION
VCC: Supply voltage during normal, Idle, and Power
Down operations.
VSS: Circuit ground.
VSS1: VSS1(E PROM PLCC only) secondary
ground. Provided to reduce ground bounce and im-
prove power supply bypassing.
NOTE:
This pin is not a substitute for the VSS pin (pin 22).
For ROM and ROMless, pin 1 is reserveddo not
connect.
Port 0:
Port 0 is an 8-bit open drain bidirectional I/O
port. As an output port each pin can sink 8 LS TTL
inputs. Port 0 pins that have 1s written to them float,
and in that state can be used as high-impedance
inputs.
Port 0 is also the multiplexed low-order address and
data bus during accesses to external memory. In this
application it uses strong internal pullups when emit-
ting 1s.
Port 0 also receives the code bytes during EPROM
programming, and outputs the code bytes during
program verification. External pullups are required
during program verification.
Port 1
: Port 1 is an 8-bit bidirectional I/O port with
internal pullups. Port 1 pins that have 1s written to
them are pulled high by the internal pullups, and in
that state can be used as inputs. As inputs, Port 1
pins that are externally being pulled low will source
current (IIL, on the datasheet) because of the inter-
nal pullups.
Port 1 also receives the low-order address bytes
during EPROM programming and program verifica-
tion.
Port 2
: Port 2 is an 8-bit bidirectional I/O port with
internal pullups. Port 2 pins that have 1s written to
them are pulled high by the internal pullups, and in
that state can be used as inputs. As inputs, Port 2
pins that are externally being pulled low will source
current (IIL, on the data sheet) because of the inter-
nal pullups.
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
address (MOVX DPTR). In this application it uses
strong internal pullups when emitting 1s.
During accesses to external Data Memory that use
8-bit addresses (MOVX Ri), Port 2 emits the con-
tents of the P2 Special Function Register.
Port 2 also receives some control signals and the
high-order address bits during EPROM programming
and program verification.
Port 3
: Port 3 is an 8-bit bidirectional I/O port with
internal pullups. Port 3 pins that have 1s written to
them are pulled high by the internal pullups, and in
that state can be used as inputs. As inputs, Port 3
pins that are externally being pulled low will source
current (IIL, on the datasheet) because of the pull-
ups.
4
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