M16C28 Datasheet, PDF (345/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
18. Flash Memory Version
18.9.2 Example of Circuit Application in Standard Serial I/O Mode
Figure 18.18 shows an example of a circuit application in standard serial I/O mode 1 and Figure 18.19
shows an example of a circuit application in standard serial I/O mode 2. Refer to the user's manual of your
serial programmer to handle pins controlled by the serial programmer.
SCLK input
TxD output
BUSY output
RxD input
Microcomputer
(1)
SCLK
P86(CE)
TXD
(1)
BUSY
P16
RxD
Reset input
User reset
singnal
RESET
CNVss
P85(RP)
(1)
(1) Controlling pins and external circuits vary with the serial programmer. For more
information, refer to the user's manual included with the serial programmer.
(2) In this example, a selector controls the input voltage applied to CNVss to switch
between single-chip mode and standard serial I/O mode.
(3) In standard serial input/output mode 1, if the user reset signal becomes “L” while
the microcomputer is communicating with the serial programmer, break the
connection between the user reset signal and the RESET pin using a jumper
switch.
NOTES:
1. Set the following, either or both.
- Connect the CE pin to Vcc
- Connect the RP pin to Vss and the P16 pin to Vcc
Figure 18.18 Circuit Application in Standard Serial I/O Mode 1
Rev. 2.00 Jan. 31, 2007 ^{page 325} of 385
REJ09B0047-0200