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参数资料
| 型号： | SAH-C505-L |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 20 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | METRIC, PLASTIC, QFP-44 |
| 文件页数： | 5/88页 |
| 文件大小： | 1224K |
| 代理商： | SAH-C505-L |
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C505/C505C/C505A/C505CA
Data Sheet
9
12.00
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 (IIL, 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 Program Store Enable
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.
ALE
27
O
The Address Latch Enable
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.
*) I = Input
O= Output
Table 2
Pin Definitions and Functions (cont’d)
Symbol
Pin Number
I/O
*)
Function
相关PDF资料 |
PDF描述 |
|---|---|
| SAH-C505A-L | 8-BIT, 20 MHz, MICROCONTROLLER, PQFP44 |
| SAK-C505A-4R | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| SAB-C505A-4E | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| SAB-C505A-L | 8-BIT, 20 MHz, MICROCONTROLLER, PQFP44 |
| SAF-C505A-4R | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
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| SAH-C517A | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-bit CMOS MICROCONTROLLER |
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