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參數(shù)資料
| 型號(hào)： | SAB-C541U-1EP |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件頁(yè)數(shù)： | 10/65頁(yè) |
| 文件大小： | 427K |
| 代理商： | SAB-C541U-1EP |
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Semiconductor Group
10
1997-10-01
C540U
C541U
P2.0 - P2.7
24 - 31
28 - 35
I/O
Port 2
is 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 resistors when issuing
1's. During accesses to external data memory that
use 8-bit addresses (MOVX @Ri), port 2 issues the
contents of the P2 special function register.
PSEN
32
38
O
The
output is a control signal that enables the external
program memory to the bus during external fetch
operations. It is activated every six oscillator
periods except during external data memory
accesses. The signal remains high during internal
program execution.
Program Store Enable
ALE
33
39
O
The
output is used for latching the address into external
memory during normal operation. It is activated
every six oscillator periods except during an
external data memory access.
Address Latch enable
EA
35
42
I
External Access Enable
When held high, the C540U/C541U executes
instructions from the internal ROM as long as the
PC is less than 1000H for the C540U or less than
2000H for the C541U. When held low, the C540U/
C541U fetches all instructions from external
program memory. For the C540U-L/C541U-L this
pin must be tied low.
*) I = Input
O = Output
Table 2
Pin Definitions and Functions (cont’d)
Symbol
Pin Numbers
I/O*) Function
P-LCC-44
P-SDIP-52
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