R8C/20 Group, R8C/21 Group 19. Flash Memory
Rev.2.00 Aug 27, 2008 Page 401 of 458
REJ09B0250-0200
Table 19.8 Pin Functions (Flash Memory Standard Serial I/O Mode 3)
Pin 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 I Reset input pin.
P4_6/XIN P4_6 input/clock input I Connect ceramic resonator or crystal oscillator
between XIN and XOUT pins when connecting external
oscillator. Apply “H” and “L” or leave the pin open when
using as input port
P4_7/XOUT P4_7 input/clock output I/O
P0_0 to P0_7 Input port P0 I Input “H” or “L” level signal or leave the pin open.
P1_0 to P1_7 Input port P1 I Input “H” or “L” level signal or leave the pin open.
P2_0 to P2_7 Input port P2 I Input “H” or “L” level signal or leave the pin open.
P3_0, P3_1,
P3_3 to P3_5,
P3_7
Input port P3 I Input “H” or “L” level signal or leave the pin open.
P4_2 to P4_5 Input port P4 I Input “H” or “L” level signal or leave the pin open.
P6_0 to P6_7 Input port P6 I Input “H” or “L” level signal or leave the pin open.
MODE MODE I/O Serial data I/O pin. connect to the flash programmer.
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