m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 212

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
M16C/26 Group
Appendix Standard Serial I/O Mode (Flash Memory Version)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Standard Serial I/O mode
The standard serial I/O mode inputs and outputs the software commands, addresses and data needed to
operate (read, program, erase, etc.) the internal flash memory using the serial I/O port UART1. The serial
I/O mode transfers the data serially in 8-bit units.
The standard serial I/O mode is different from the parallel I/O mode in that the CPU executes a control
program for flash memory rewrite (using the CPU's rewrite mode), rewrite data input and so forth. It is
started when both the P8
(CE) pin and the CNVss pin are in “H” level after the reset is released. (In normal
6
operation mode, set CNVss pin to “L” level.)
Figure 1.22.1 shows the pin connections for the standard serial I/O mode.
There are actually two standard serial I/O modes: mode 1, which is clock synchronized, and mode 2, which
is asynchronized. Standard serial I/O switches between mode 1 (clock synchronous) and mode 2 (clock
asynchronous) depending on the level of CLK
pin when the reset is released.
1
To use standard serial I/O mode 1 (clock synchronous), set the CLK
pin to “H” level and release the reset.
1
The operation uses the four UART1 pins CLK
, RxD
, TxD
and RTS
(BUSY). The CLK
pin is the transfer
1
1
1
1
1
clock input pin through which an external transfer clock is input. The TxD
pin is for CMOS output. The
1
RTS
(BUSY) pin outputs an “L” level when ready for reception and an "H" level when reception starts. In
1
mode 1, be sure the T
D
(P6
) pin is at high before reset being deasserted.
X
1
7
To use standard serial I/O mode 2 (clock asynchronous), set the CLK
pin to “L” level and release the reset.
1
The operation uses the two UART1 pins RxD
and TxD
.
1
1
In the standard serial I/O mode, only the user ROM area indicated in Figure 1.19.1 can be rewritten. In
addition, a 7-byte ID code exists to protect the device. When there is data in the flash memory, commands
sent from the peripheral unit are not accepted unless the ID code matches.
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Renesas Technology Corp.