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7549 Datasheet(PDF) 6 Page - Renesas Technology Corp

Part No. 7549
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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 6 page
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Rev.2.00
Mar 05, 2007
Page 6 of 70
REJ03B0202-0200
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
PIN DESCRIPTION
NOTE:
1. The oscillation circuit is built in the P20/XOUT/XCOUT pin and the P21/XIN/XCIN pin. When the Vcc of the microcomputer is lower than
the operation lower bound voltage even if these pins are used as I/O ports, the oscillation circuit is connected and undefined values
may be output from these pins.
Table 2
Pin description
Pin
Name
Function
Function expect a port function
VCC,VSS
Power source
Apply voltage of 1.8 to 5.5 V to Vcc, and 0 V to Vss.
CNVSS
CNVSS
Controls the operation mode of the chip. Connected to VSS.
RESET
Reset input
Reset input pin for active “L”
P00(LED0)/INT0
P01(LED1)/INT1
I/O port P0
•8-bit I/O port.
•I/O direction register allows each pin to be individu-
ally programmed 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 determined by program.
•High drive capacity for LED drive port can be
selected by program.
Interrupt input pin
P02(LED2)
P03(LED3)/CAP0
Capture input pin
P04(LED4)/RXD
P05(LED5)/TXD
P06(LED6)/SCLK
P07(LED7)/SRDY
Serial interface function pin
P10/AN0/KEY0/CMP0
P11/AN1/KEY1/CMP1
P12/AN2/KEY2/CMP2
I/O port P1
•8-bit I/O port.
•I/O direction register allows each pin to be individu-
ally programmed 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 determined by program.
Input pins
for A/D
converter
Key-input
(key-on
wake up
interrupt
input) pin
Compare
output
pin
P13/AN3/KEY3/T2OUT
Timer 2
output
pin
P14/AN4/KEY4
P15/AN5/KEY5
P16/AN6/KEY6
P17/AN7/KEY7
P20/XOUT/XCOUT
P21/XIN/XCIN (Note)
I/O port P2
•2-bit I/O port. (P20/XOUT/XCOUT is only for output)
•I/O direction register allows each pin to be individu-
ally programmed as either input or output.
•CMOS compatible input level
•CMOS 3-state output structure
•Function set ROM allows pins to be used as clock
pins.
Pins XIN and XOUT, or pins XCIN
and XCOUT, can be used as clock
pins by connecting a ceramic
resonator, crystal oscillator, or 32
kHz crystal oscillator between
them. Alternately, an external
clock may be input to the
P20/XOUT/XCOUT pin. In this case,
the P21/XIN/XCIN pin can be used
as an I/O port.
P30, P31
I/O port P3
•2-bit 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




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