Lucent Technologies MN102H75K User Manual
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 for the Target Board
■
During programming, the serial writer supplies V
PP
to the microcontroller.
Install a switch on the target board to toggle between V
PP
supplied by the
serial writer and V
PP
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
5V is supplied to Vpp by checking the connection and reducing the
impedance of switches.
■
You must supply a V
DD
source of 3.0 V – 3.3 V externally.
■
V
DD
(for level detection) informs the serial writer of the actual V
DD
level of
the target board. If the V
DD
level is too low, the serial writer generates an
error message.
■
Connect pullup resistors on the target board to the RST, SBT, and SBD pins.
Use a pullup resistor value of 10 k
Ω
±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.
connection, disable RST for normal operation during serial programming.
■
RST, SBT, and SBD are output from the serial writer through an open con-
nection.
nection.
Figure B-6 Target Board–Serial Writer Connection
Table B-3 Pin Descriptions for Target Board–Serial Writer Connection
Pin Name
Description
V
PP
5-V power supply
V
DD
3.0– 3.3 external power supply
V
DD
(for level detection)
V
DD
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, V
PP
should always be equal to
V
DD
(3.3 ±0.3 V). Apply 5 V to the V
PP
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 source
3.0 V - 3.3 V
power source
3.0 V - 3.3 V
V
DD
GND
10 k
Ω
Target board