MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 140

• 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)
8.1.1
8.1.2
140/995
Table 17.
Table 18.
General-purpose I/O (GPIO)
During and just after reset, the alternate functions are not active and the I/O ports are
configured in Input Floating mode (CNFx[1:0]=01b, MODEx[1:0]=00b).
The JTAG pins are in input PU/PD after reset:
When configured as output, the value written to the Output Data register (GPIOx_ODR) is
output on the I/O pin. It is possible to use the output driver in Push-Pull mode or Open-Drain
mode (only the N-MOS is activated when outputting 0).
The Input Data register (GPIOx_IDR) captures the data present on the I/O pin at every
APB2 clock cycle.
All GPIO pins have an internal weak pull-up and weak pull-down which can be activated or
not when configured as input.
Atomic bit set or reset
There is no need for the software to disable interrupts when programming the GPIOx_ODR
at bit level: it is possible to modify only one or several bits in a single atomic APB2 write
access. This is achieved by programming to ‘1’ the Bit Set/Reset Register (GPIOx_BSRR,
General purpose
output
Alternate Function
output
Input
PA15: JTDI in PU
PA14: JTCK in PD
PA13: JTMS in PU
PB4: JNTRST in PU
Configuration mode
Port bit configuration table
Output MODE bits
MODE[1:0]
00
01
10
11
Push-pull
Open-drain
Push-pull
Open-drain
Analog input
Input floating
Input pull-down
Input pull-up
Doc ID 13902 Rev 9
CNF1
0
1
0
1
CNF0
0
1
0
1
0
1
0
Max. output speed 10 MHz
Max. output speed 50 MHz
Max. output speed 2 MHz
MODE1
see
Reserved
Meaning
Table 18
01
10
11
00
MODE0
don’t care
don’t care
don’t care
don’t care
register
PxODR
0 or 1
0 or 1
RM0008
0
1