MN102HF75K Flash EEPROM Version
Using the Onboard Serial Programming Mode
MN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company
321
Panasonic
B.4.2 Circuit Requirements fo r the Target Board
During programming, the serial write r supplies VPP to the microcontroller.
Install a switch on the target board to toggle between VPP supplied by the
serial writer and VPP for normal operation.
In serial programing a large-scale of current flows through Vpp. See to it that
5V is supplied to Vpp by checking the connection and reducing the
impedance of switches.
You mus t s up ply a V DD source of 3.0 V – 3.3 V externally.
VDD (for level detection) informs the serial writer of the actual VDD level of
the target board. If the VDD level is too low, the serial writer generates an
error message.
Connect pullup resistors on the target board to t he R S T, SBT, and SBD pins.
Use a pullup resistor value of 10 k ±10%. Install a switch on the target
board to toggle between RST for serial programming and RST for normal
operation. Alternatively, install a wired-OR connection. For a wired-OR
connection, disable RST for normal operation during serial programming.
RST, SBT, and SBD are output from the serial writer through an open con-
nection.
Figure B-6 Target Board–Serial Writer Connection
Table B-3 Pin Descriptions for Target Board– Serial Writer Connection
Pin Name Description
VPP 5-V power supply
VDD 3.0–3.3 external power supply
VDD (for level detection) VDD level detection pin for target board
RST Reset
SBT Serial interface clock supply
SBD Serial interface data supply
GND Ground
Note: 1. During normal microcontroller operation, VPP should always be equal to
VDD (3.3 ±0.3 V). Apply 5 V to the VPP supply only when programming
the flash memory.
Serial
writer
V
PP
= +5 V
GND
SBT
SBD
RST
V
DD
(for level detection)
MCU
SBT1
SBD1
RST V
PP
External
power sourc
e
3.0 V - 3.3 V
V
DD
GND
10 k
Target board