DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 644

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

20.5.2
Software protection is set up in any of two ways: by disabling the downloading of on-chip
programs for programming and erasing and by means of a key code.
Table 20.10 Software Protection
Item
Protection by
SCO bit
Protection by
FKEY
20.5.3
Error protection is a mechanism for forcibly suspended programming or erasure when an error
occurs, in the form of the microcomputer entering runaway during programming/erasing of the
flash memory or operations that are not according to the specified procedures for
programming/erasing. Forcibly suspending programming or erasure in such cases prevents
damage to the flash memory due to excessive programming or erasing.
If the microcomputer malfunctions during programming/erasing of the flash memory, the FLER
bit in FCCS is set to 1 and the error-protection state is entered, and this suspends the programming
or erasure.
The FLER bit is set in the following conditions:
1. When an interrupt such as NMI occurs during programming/erasing
2. When the flash memory is read during programming/erasing (including a vector read or an
3. When a SLEEP instruction (including software standby mode) is executed during
Error protection is canceled by a reset or in hardware standby mode. Note that the reset should be
released after the reset period of 100 μs which is longer than normal. Since high voltages are
applied during programming/erasing of the flash memory, some voltage may remain after the
Rev.2.00 May. 28, 2009 Page 604 of 732
REJ09B0059-0200
instruction fetch)
programming/erasing
Software Protection
Error Protection
Description
•
•
The program/erase-protected state is entered
by clearing the SCO bit in FCCS to 0 which
disables the downloading of the
programming/erasing programs.
Downloading and programming/erasing are
disabled unless the required key code is
written in FKEY. Different key codes are used
for downloading and for programming/erasing.
Download Program/Erase
Function to be Protected