STR720 datasheet(17/401 Pages) STMICROELECTRONICS

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STR720 - PIN DATA

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4.6 Port 3 pins

Port 3 consists of 13 bidirectional general purpose I/O pins. They are controlled through a

configuration register, a data register and a direction register. These registers are read/write

registers. Port lines can be individually configured as general purpose inputs, general

purpose outputs or dedicated peripheral lines. The port can be read at any time: input lines

return the pin level; output lines return the level of the output driver input. When written, the

port stores the data in an internal register: it drives the pins only if they are configured as

general purpose outputs. Port 3 outputs can be configured as push/pull or open drain drivers.

P2.10

134

I/O

Port 2 General Purpose Input/Output data line 10.

USB. USB interface 48 MHz clock input (USBCK).

P2.11

135

I/O

Port 2 General Purpose Input/Output data line 11.

CAN. CAN module receive pin (CANRX).

P2.12

136

I/O

Port 2 General Purpose Input/Output data line 12.

CAN. CAN module transmit pin (CANTX).

P2.13

137

I/O

Port 2 General Purpose Input/Output data line 13.

EFT1. Timer 1 External Clock Input line (ECLK1).

P2.14

138

I/O

Port 2 General Purpose Input/Output data line 14.

I/O

USB. USB interface D- signal (USBDM). The usage of this alternate function require a

special programming of GPIO registers.

P2.15

139

I/O

Port 2 General Purpose Input/Output data line 15.

I/O

USB. USB interface D+ signal (USBDP). The usage of this alternate function require a

special programming of GPIO registers.

Table 7. Port 3 Pins

Symbol

I/O

Function

P3.0

144

I/O

Port 3 General Purpose Input/Output line 0.

P3.1

145

I/O

Port 3 General Purpose Input/Output line 1.

P3.2

146

I/O

Port 3 General Purpose Input/Output line 2.

P3.3

147

I/O

Port 3 General Purpose Input/Output data line 3.

P3.4

148

I/O

Port 3 General Purpose Input/Output data line 4.

P3.5

149

I/O

Port 3 General Purpose Input/Output data line 5.

P3.6

150

I/O

Port 3 General Purpose Input/Output data line 6.

SYS EXT_BOOT. External boot mode selection. The state of this pin is sampled at

reset.

P3.7

151

I/O

Port 3 General Purpose Input/Output data line 7.

WIU. Stop mode request, active low (STOP_REQ).

Table 6. Port 2 Pins (Continued)

Symbol

I/O

Function

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