tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 342

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.4 Example Connection for On-board Writing
22. Serial PROM Mode
RA002
22.4 Example Connection for On-board Writing
Figure 22-2 shows example connections to perform on-board writing.
Note 1: If other parts on a target board interfere with the UART communication in serial PROM mode, disconnect these
Note 2: If the reset control circuit on a target board interferes with the startup of serial PROM mode, disconnect the circuit
Note 3: For information on other pin settings, refer to "Table 22-3 Pin Functions in Serial PROM Mode".
TMP89FM42
TMP89FM42
pins by using a jumper or switch.
by using a jumper, etc.
SCLK0 (P22)
RXD0 (P21)
TXD0 (P20)
SO0 (P20)
SI0 (P21)
RESET
RESET
MODE
MODE
XOUT
XOUT
VDD
VDD
VSS
VSS
Figure 22-2 Example Connections for On-board Writing
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 328
GND
GND
RC power-on
reset circuit
RC power-on
reset circuit
External control board
External control board
Pull-up resistors
VDD
Level
converter
VDD
Pull-up resistors
(4.5 V to 5.5 V)
(4.5 V to 5.5 V)
Microcomputer,
etc.
PC control
TMP89FM42