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| 型號(hào)： | SABC517A-LN |
| 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單片機(jī) |
| 文件頁(yè)數(shù)： | 10/72頁(yè) |
| 文件大小： | 845K |
| 代理商： | SABC517A-LN |
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C517A
Semiconductor Group
8
PSEN
22
49
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 six oscillator periods except during
external data memory accesses. The signal
remains high during internal program
execution.
ALE
23
50
O
The
Address Latch enable
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.
EA
24
51
I
External Access Enable
When held high, the C517A executes
instructions from the internal ROM as long
as the PC is less than 8000H. When held
low, the C517A fetches all instructions from
external program memory. For the C517A-L
this pin must be tied low. For the C517A-4R,
if the device is protected (see section 4.6 in
the User Manual) then this pin is only
latched during reset.
P0.0 - P0.7
26, 27,
30 - 35
52 - 59
I/O
Port 0
is an 8-bit open-drain bidirectional 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 pullup resistors when issuing
1’s. Port 0 also outputs the code bytes
during program verification in the C517A-
4R. External pullup resistors are required
during program verification.
*) I = Input
O = Output
Table 1
Pin Definitions and Functions
(cont’d)
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