MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 142

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

General-purpose and alternate-function I/Os (GPIOs and AFIOs)
8.1.7
8.1.8
142/995
Input configuration
When the I/O Port is programmed as Input:
●
●
●
●
●
The
Figure 15. Input floating/pull up/pull down configurations
1. V
Output configuration
When the I/O Port is programmed as Output:
●
●
●
●
●
●
The
Write
DD_FT
Figure 15 on page 142
Figure 16 on page 143
Read/write
The Output Buffer is disabled
The Schmitt Trigger Input is activated
The weak pull-up and pull-down resistors are activated or not depending on input
configuration (pull-up, pull-down or floating):
The data present on the I/O pin is sampled into the Input Data Register every APB2
clock cycle
A read access to the Input Data Register obtains the I/O State.
The Output Buffer is enabled:
–
–
The Schmitt Trigger Input is activated.
The weak pull-up and pull-down resistors are disabled.
The data present on the I/O pin is sampled into the Input Data Register every APB2
clock cycle
A read access to the Input Data Register gets the I/O state in open drain mode
A read access to the Output Data register gets the last written value in Push-Pull mode
Read
is a potential specific to five-volt tolerant I/Os and different from V
Open Drain Mode: A “0” in the Output register activates the N-MOS while a “1” in
the Output register leaves the port in Hi-Z. (the P-MOS is never activated)
Push-Pull Mode: A “0” in the Output register activates the N-MOS while a “1” in the
Output register activates the P-MOS.
shows the Input Configuration of the I/O Port bit.
shows the Output configuration of the I/O Port bit.
output driver
input driver
Doc ID 13902 Rev 9
trigger
TTL Schmitt
on
on/off
on/off
V
V
SS
DD
DD
.
V
V
DD
SS
or V
protection
diode
protection
diode
DD_FT
I/O pin
RM0008
(1)
ai14783