参数资料
型号: SAB-C515-RN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 114/162页
文件大小: 771K
代理商: SAB-C515-RN
Semiconductor Group
6-12
On-Chip Peripheral Components
C515
6.1.4 Port Loading and Interfacing
The output buffers of ports 1 to 5 can drive TTL inputs directly. The maximum port load which still
guarantees correct logic output levels can be be looked up in the DC characteristics in the Data
Sheet of the C515 or in chapter 10 of this User’s Manual. The corresponding parameters are
V
OL
and
V
OH.
The same applies to port 0 output buffers. They do, however, require external pullups to drive
floating inputs, except when being used as the address/data bus.
When used as inputs it must be noted that the ports 1 to 5 are not floating but have internal pullup
transistors. The driving devices must be capable of sinking a sufficient current if a logic low level
shall be applied to the port pin (the parameters
I
TL and IIL in the DC characteristics specify these
currents). Port 0 as well as port 1 programmed to analog input function, however, have floating
inputs when used for digital input.
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