Toshiba H1 Series Data Book page 60

(5) Others
a) Handshake function
Although the
not use it for transfer control.
b) RS-232C connector
The RS-232C connector must not be connected or disconnected while the boot
program is running.
c) Software on the PC
When downloading a user program via UART, special application software is
needed on the PC.
pin is available in the TMP92CZ26A, the boot program does
CTS
92CZ26A-57
TMP92CZ26A