STR720 datasheet(18/401 Pages) STMICROELECTRONICS

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STR720 - PIN DATA

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4.7 Port 4 pins

Port 4 consists of 5 bidirectional general purpose I/O pins. They are under ARM720 control

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 4 outputs can be configured as push/pull or open drain drivers.

P3.8

152

I/O

Port 3 General Purpose Input/Output data line 8.

External Interrupt 0 (EINT0).

P3.9

153

I/O

Port 3 General Purpose Input/Output data line 9.

External Interrupt 1(EINT1‘).

BSPI1. Slave Mode. Slave select line (SS1).

P3.10

154

I/O

Port 3 General Purpose Input/Output data line 10.

External Interrupt 2 (EINT2).

BSPI2. Slave Mode. Slave select line (SS2).

P3.11

155

I/O

Port 3 General Purpose Input/Output data line 11.

External Interrupt 3 (EINT3).

RCCU. PLL lock status (PLL_LOCK).

P3.12

156

I/O

Port 3 General Purpose Input/Output data line 12.

External Interrupt 4 (EINT4).

EFT2 Timer 2 Input Capture line B (ICAPB2).

Table 8. Port 4 Pins

Symbol

I/O

Function

P4.0

I/O

Port 4 General Purpose Input/Output data line 0.

EMI External Ready signal (Eready).

P4.1

I/O

Port 4 General Purpose Input/Output data line 1.

P4.2

I/O

Port 4 General Purpose Input/Output data line 2.

P4.3

I/O

Port 4 General Purpose Input/Output data line 3.

P4.4

I/O

Port 4 General Purpose Input/Output data line 4.

EMI active low Chip Select - bank 1 (Ecs1n).

Table 7. Port 3 Pins (Continued)

Symbol

I/O

Function

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