参数资料
型号: C540U
厂商: SIEMENS AG
元件分类: 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
文件页数: 11/65页
文件大小: 427K
代理商: C540U
Semiconductor Group
11
1997-10-01
C540U
C541U
P0.0 - P0.7
44 - 36
50 - 43
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.
V
CCU
1
1
Supply voltage
for the on-chip USB transceiver circuitry.
V
SSU
2
2
Ground
for the on-chip USB transceiver circuitry.
(0V)
V
CC
8, 23
10, 26
Supply voltage
for ports and internal logic circuitry during normal,
idle, and power down mode.
V
SS
9, 22
11, 25
Ground
for ports and internal logic circuitry during normal,
idle, and power down mode.
(0V)
*) 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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