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參數(shù)資料
| 型號： | C505-LM |
| 廠商： | SIEMENS AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 11/85頁 |
| 文件大?。?/td> | 335K |
| 代理商： | C505-LM |
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Semiconductor Group
11
1997-12-01
C505 / C505C
C505A / C505CA
P2.0-P2.7
18-25
I/O
Port 2
is a an 8-bit quasi-bidirectional I/O port with internal pullup
resistors. Port 2 pins that have 1’s written to them are pulled
high by the internal pullup resistors, and in that state can be
used as inputs. As inputs, port 2 pins being externally pulled
low will source current (
I
IL
, in the DC characteristics)
because of the internal pullup resistors. 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 pullup transistors when
issuing 1s. During accesses to external data memory that
use 8-bit addresses (MOVX @Ri), port 2 issues the
contents of the P2 special function register and uses only
the internal pullup resistors.
PSEN
26
O
The
output is a control signal that enables the external program
memory to the bus during external fetch operations. It is
activated every three oscillator periods except during
external data memory accesses. Remains high during
internal program execution. This pin should not be driven
during reset operation.
Program Store
Enable
ALE
27
O
The
output is used for latching the low-byte of the address into
external memory during normal operation. It is activated
every three oscillator periods except during an external data
memory access. When instructions are executed from
internal ROM or OTP (EA=1) the ALE generation can be
disabled by bit EALE in SFR SYSCON.
ALE should not be driven during reset operation.
Address Latch Enable
*) I = Input
O= Output
Table 3
Pin Definitions and Functions
(cont’d)
Symbol
Pin Number
I/O
*)
Function
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| C505A-4EM | 8-Bit CMOS Microcontroller |
| C505C-LM | 8-Bit CMOS Microcontroller |
| C505CA-2R | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| C505CA-4E | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| C505CA-4R | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C505MB290-S0600 | 制造商:CREE 制造商全稱:Cree, Inc 功能描述:MegaBright㈢ Generation II LEDs |
| C505RT230-0101 | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:RazerThin LEDs |
| C505RT230-0102 | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:RazerThin LEDs |
| C505RT230-0103 | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:RazerThin LEDs |
| C505RT230-0104 | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:RazerThin LEDs |
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