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参数资料
| 型号： | SJ80C52XXX-12SC |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44 |
| 封装： | JLCC-44 |
| 文件页数： | 15/20页 |
| 文件大小： | 194K |
| 代理商： | SJ80C52XXX-12SC |
80C32/80C52/80C32E
4
Rev. J
– July 03, 2000
4. Pin Description
4.1. VSS
Circuit ground potential.
4.2. VCC
Supply voltage during normal, Idle, and Power Down operation.
4.3. Port 0
Port 0 is an 8 bit open drain bi-directional I/O port. Port 0 pins that have 1’s 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 Program and Data Memory.
In this application it uses strong internal pullups when emitting 1’s. Port 0 also outputs the code bytes during program
verification in the 80C52. External pullups are required during program verification. Port 0 can sink eight LS TTL
inputs.
4.4. Port 1
Port 1 is an 8 bit bi-directional I/O port with internal pullups. Port 1 pins that have 1’s 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 data sheet) because of the internal pullups.
Port 1 also receives the low-order address byte during program verification. In the 80C52, Port 1 can sink/ source three
LS TTL inputs. It can drive CMOS inputs without external pullups.
2 inputs of PORT 1 are also used for timer/counter 2 :
P1.0 [T2]: External clock input for timer/counter 2. P1.1 [T2EX]: A trigger input for timer/counter 2, to be reloaded
or captured causing the timer/counter 2 interrupt.
4.5. Port 2
Port 2 is an 8 bit bi-directional I/O port with internal pullups. Port 2 pins that have 1’s 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 (ILL, on the data sheet) because of the internal 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
addresses (MOVX @DPTR). In this application, it uses strong internal pullups when emitting 1’s. During accesses to
external Data Memory that use 8 bit addresses (MOVX @Ri), Port 2 emits the contents of the P2 Special Function
Register.
It also receives the high-order address bits and control signals during program verification in the 80C52. Port 2 can
sink/source three LS TTL inputs. It can drive CMOS inputs without external pullups.
4.6. Port 3
Port 3 is an 8 bit bi-directional I/O port with internal pullups. Port 3 pins that have 1’s 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 (ILL, on the data sheet) because of the pullups. It also serves the functions of various special
features of the TEMIC 51 Family, as listed below.
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