tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 365

• Manufacturer Part Number: tmp89fm42a
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.4
Example Connection for On-board Writing
RA003
22.4
Note 1: If other parts on a target board interfere with the UART communication in serial PROM mode, disconnect these pins by
Note 2: If the reset control circuit on a target board interferes with the startup of serial PROM mode, disconnect the circuit by using
Note 3: For information on other pin settings, refer to "Table 22-3 Pin Functions in Serial PROM Mode".
Figure 22-2 shows example connections to perform on-board writing.
Example Connection for On-board Writing
TMP89FM42A
TMP89FM42A
using a jumper or switch.
a jumper, etc.
SCLK0 (P22)
RXD0 (P21)
TXD0 (P20)
SO0 (P20)
SI0 (P21)
RESET
RESET
MODE
MODE
Figure 22-2 Example Connections for On-board Writing
XOUT
XOUT
VDD
VDD
VSS
VSS
XIN
XIN
Target board
Target board
Serial PROM mode
MCU mode
Serial PROM mode
MCU mode
(Note 1)
(Note 1)
Other
parts
Other
parts
(Note 2)
(Note 2)
RESET
control
RESET
control
If UART is used
If SIO is used
Page 346
GND
GND
RC power-on
reset circuit
RC power-on
reset circuit
External control board
External control board
Pull-up resistors
Level
converter
VDD
VDD
Pull-up resistors
(4.3 V to 5.5 V)
(4.3 V to 5.5 V)
Microcomputer,
etc.
PC control
TMP89FM42A