M16C6NK Datasheet, PDF (304/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
21. Flash Memory Version
21.4.2 Example of Circuit Application in Standard Serial I/O Mode
Figures 21.15 and 21.16 show example of circuit application in standard serial I/O mode 1 and mode 2,
respectively. Refer to the user’s manual of your serial programmer to handle pins controlled by a serial
programmer.
Note that when using the standard serial I/O mode 2, make sure a main clock input oscillation frequency
is set to 5 MHz, 10 MHz or 16 MHz.
VCC1
SCLK input
TXD output
VCC1
BUSY output
RXD input
VCC1
Microcomputer
VCC2
P6_6/CLK1
P6_7/TXD1
P5_0(CE)
P5_5(EPM)
P6_4/RTS1
VCC1
P6_6/RXD1
CNVSS
Reset input
User reset
signal
RESET
VCC1
P8_5/NMI
NOTES:
1.Control pins and external circuitry will vary according to programmer.
For more information, refer to the programmer manual.
2.In this example, modes are switched between single-chip mode and standard serial
I/O mode by controlling the CNVSS input with a switch.
3.If in standard standard serial I/O mode 1 there is a possibility that the user reset
signal will go low during standard serial I/O mode, break the connection between
the user reset signal and RESET pin by using, for example, a jumper switch.
Figure 21.15 Circuit Application in Standard Serial I/O Mode 1
TXD output
Monitor output
RXD input
VCC1
Microcomputer
VCC2
P6_5/CLK1
P6_7/TXD1
P6_4/RTS1
P6_6/RXD1
P5_0(CE)
P5_5(EPM)
VCC1
CNVSS
Reset input
User reset
signal
RESET
VCC1
P8_5/NMI
NOTES:
1.In this example, modes are switched between single-chip mode and standard serial I/O
mode by controlling the CNVSS input with a switch.
Figure 21.16 Circuit Application in Standard Serial I/O Mode 2
Rev.2.00 Nov 28, 2005 page 286 of 378
REJ09B0124-0200