7540 datasheet(27/366 Pages) RENESAS

27 / 366 page

1-8

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

HARDWARE

7540 Group

PIN DESCRIPTION

Table 1 Pin description

Function

•Apply voltage of 2.2 to 5.5 V to Vcc, and 0 V to Vss.

•Reference voltage input pin for A/D converter

•Chip operating mode control pin, which is always connected to Vss.

•Reset input pin for active “L”

•Input and output pins for main clock generating circuit

•Connect a ceramic resonator or quartz crystal oscillator between the XIN and XOUT pins.

•For using RC oscillator, short between the XIN and XOUT pins, and connect the capacitor and resistor.

•If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open.

• When the on-chip oscillator is selected as the main clock, connect XIN pin to VSS and leave XOUT open.

Function expect a port function

Name

Power source

(Note 1)

Analog reference

voltage

CNVss

Reset input

Clock input

I/O port P0

I/O port P1

Vcc, Vss

VREF

CNVss

RESET

XIN

P00/CNTR1

P01/TYOUT

P02/TZOUT

P03/TXOUT

P04–P07

Notes 1: VCC = 2.4 to 5.5 V for the extended operating temperature version and the extended operating temperature 125 °C version.

2: P26/AN6 and P27/AN7 do not exist for the 32-pin version, so that Port P2 is a 6-bit I/O port.

3: P35 and P36/INT1 do not exist for the 32-pin version, so that Port P3 is a 6-bit I/O port.

• Key-input (key-on wake up

interrupt input) pins

• Timer Y, timer Z, timer X and

timer A function pin

•8-bit I/O port.

•I/O direction register allows each pin to be individually pro-

grammed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•Whether a built-in pull-up resistor is to be used or not can be de-

termined by program.

•5-bit I/O port

•I/O direction register allows each pin to be individually pro-

grammed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•CMOS/TTL level can be switched for P10, P12 and P13

•8-bit I/O port having almost the same function as P0

•CMOS compatible input level

•CMOS 3-state output structure

•8-bit I/O port

P10/RxD1

P11/TxD1

P12/SCLK1/SCLK2

P13/SRDY1/SDATA2

P14/CNTR0

P20/AN0–P27/AN7

P30–P35

P36/INT1

P37/INT0

I/O port P2

(Note 2)

I/O port P3

(Note 3)

• Serial I/O1 function pin

• Serial I/O2 function pin

• Timer X function pin

• Input pins for A/D converter

• Interrupt input pins

•I/O direction register allows each pin to be individually programmed as either input or output.

•CMOS compatible input level (CMOS/TTL level can be switched for P36 and P37).

•CMOS 3-state output structure

•P30 to P36 can output a large current for driving LED.

XOUT

Clock output

•Whether a built-in pull-up resistor is to be used or not can be de-

termined by program.

PIN DESCRIPTION

7540 Datasheet(PDF) 27 Page - Renesas Technology Corp

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