R8C2K datasheet(410/471 Pages) RENESAS

410 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 393 of 450

REJ09B0406-0110

Figure 20.25

Example of Pin Processing in Standard Serial I/O Mode 2

Table 20.7

Pin Functions (Flash Memory Standard Serial I/O Mode 2)

Name

I/O

Description

VCC, VSS

Power input

Apply the voltage guaranteed for programming and

erasure to the VCC pin and 0 V to the VSS pin.

RESET

Reset input

Reset input pin.

P4_6/XIN

P4_6 input/clock input

Connect a ceramic resonator or crystal oscillator

between the XIN and XOUT pins.

P4_7/XOUT

P4_7 input/clock output

I/O

P0_1 to P0_3, P0_5

Input port P0

Input “H” or “L” level signal or leave the pin open.

P1_0 to P1_7

Input port P1

P2_0 to P2_7

Input port P2

P3_3 to P3_5

Input port P3

P4_2/VREF

Input port P4

MODE

I/O Input “L”.

P0_0

TXD output

Serial data output pin.

P4_5

RXD input

Serial data input pin.

NOTES:

1. In this example, modes are switched between single-chip mode and standard serial I/O mode

by controlling the MODE input with a switch.

2. An oscillator must be connected. Set the main clock frequency to 1 MHz to 20 MHz.

Refer to Appendix Figure 2.1 Connection Example with M16C Flash Starter (M3A-0806).

MCU

TXD

RXD

Data output

Data input

MODE

VCC

AVCC

VSS

AVSS

RESET

User reset signal

Connect an oscillation circuit(2)

XIN

XOUT

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