EM773 datasheet(6/51 Pages) PHILIPS

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EM773

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Product data sheet

Rev. 2 — 3 January 2012

6 of 51

NXP Semiconductors

EM773

Energy metering IC

6.2 Pin description

Table 2.

EM773 pin description table

Symbol

Start

logic

input

Type

Reset

state

[1]

Description

PIO0_0 to PIO0_10

I/O

Port 0 — Port 0 is a 12-bit I/O port with individual

direction and function controls for each bit. The

operation of port 0 pins depends on the function

selected through the IOCONFIG register block. Pin

PIO0_11 is not available.

RESET/PIO0_0

2[2]

yes

I;PU

RESET — External reset input with 20 ns glitch filter. A

LOW-going pulse as short as 50 ns on this pin resets

the device, causing I/O ports and peripherals to take on

their default states, and processor execution to begin at

address 0.

I/O

PIO0_0 — General purpose digital input/output pin.

PIO0_1/CLKOUT/

CT32B0_MAT2

3[3]

yes

I/O

I;PU

PIO0_1 — General purpose digital input/output pin. A

LOW level on this pin during reset starts the ISP

command handler.

O-

CLKOUT — Clock out pin.

O-

CT32B0_MAT2 — Match output 2 for 32-bit timer 0.

PIO0_2/SSEL0/

CT16B0_CAP0

8[3]

yes

I/O

I;PU

PIO0_2 — General purpose digital input/output pin.

I/O

SSEL0 — Slave select for SPI0.

I-

CT16B0_CAP0 — Capture input 0 for 16-bit timer 0.

PIO0_3

9[3]

yes

I/O

I;PU

PIO0_3 — General purpose digital input/output pin.

PIO0_4/SCL

10[4]

yes

I/O

PIO0_4 — General purpose digital input/output pin

(open-drain).

I/O

SCL — I2C-bus, open-drain clock input/output.

High-current sink only if I2C Fast-mode Plus is selected

in the I/O configuration register.

PIO0_5/SDA

11[4]

yes

I/O

PIO0_5 — General purpose digital input/output pin

(open-drain).

I/O

SDA — I2C-bus, open-drain data input/output.

High-current sink only if I2C Fast-mode Plus is selected

in the I/O configuration register.

PIO0_6/SCK0

15[3]

yes

I/O

I;PU

PIO0_6 — General purpose digital input/output pin.

I/O

SCK0 — Serial clock for SPI0.

PIO0_7/CTS

16[3]

yes

I/O

I;PU

PIO0_7 — General purpose digital input/output pin

(high-current output driver).

I-

CTS — Clear To Send input for UART.

PIO0_8/MISO0/

CT16B0_MAT0

17[3]

yes

I/O

I;PU

PIO0_8 — General purpose digital input/output pin.

I/O

MISO0 — Master In Slave Out for SPI0.

O-

CT16B0_MAT0 — Match output 0 for 16-bit timer 0.

PIO0_9/MOSI0/

CT16B0_MAT1

18[3]

yes

I/O

I;PU

PIO0_9 — General purpose digital input/output pin.

I/O

MOSI0 — Master Out Slave In for SPI0.

O-

CT16B0_MAT1 — Match output 1 for 16-bit timer 0.

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