3850 datasheet(7/103 Pages) RENESAS

7 / 103 page

Rev.3.01

2003.06.20

page 5 of 98

3850 Group (Spec.H)

VCC, VSS

Functions

Name

•Apply voltage of 2.7 V – 5.5 V to Vcc, and 0 V to Vss.

•This pin controls the operation mode of the chip.

•Normally connected to VSS.

•Reset input pin for active “L”.

•Input and output pins for the clock generating circuit.

•Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set

the oscillation frequency.

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

pin open.

•8-bit CMOS I/O port.

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

programmed as either input or output.

•CMOS compatible input level.

•CMOS 3-state output structure.

•P10 to P17 (8 bits) are enabled to output large current for LED drive.

Power source

Table 1 Pin description (spec. H)

Function except a port function

Clock input

Clock output

I/O port P0

CNVSS input

CNVSS

RESET

Reset input

XIN

XOUT

P00/SIN2

P01/SOUT2

P02/SCLK2

P03/SRDY2

P04–P07

I/O port P1

P10–P17

• Serial I/O2 function pin

• Sub-clock generating circuit I/O

pins (connect a resonator)

I/O port P2

I/O port P3

I/O port P4

•8-bit CMOS I/O port.

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

programmed as either input or output.

•CMOS compatible input level.

•P20, P21, P24 to P27: CMOS3-state output structure.

•P22, P23: N-channel open-drain structure.

• Serial I/O1 function pin

• Serial I/O1 function pin/

Timer X function pin

• A-D converter input pin

• Timer Y function pin

• Interrupt input pins

• Interrupt input pin

• SCMP2 output pin

• Interrupt input pin

• PWM output pin

•8-bit CMOS I/O port with the same function as port P0.

•CMOS compatible input level.

•CMOS 3-state output structure.

•8-bit CMOS I/O port with the same function as port P0.

•CMOS compatible input level.

•CMOS 3-state output structure.

P20/XCOUT

P21/XCIN

P22

P23

P24/RxD

P25/TxD

P26/SCLK1

P27/CNTR0/

SRDY1

P30/AN0–

P34/AN4

P40/CNTR1

P41/INT0

P42/INT1

P43/INT2/SCMP2

P44/INT3/PWM

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