DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 645

• 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: -

error-protection state has been entered. For this reason, it is necessary to reduce the risk of damage
to the flash memory by extending the reset period so that the charge is released.
Figure 20.16 shows state transitions to and from the error-protection state.
20.6
It is possible to switch between the user MAT and user boot MAT. However, the following
procedure is required because these MATs are allocated to address 0.
(Switching to the user boot MAT disables programming and erasing. Programming of the user
boot MAT should take place in boot mode or programmer mode.)
1. MAT switching by FMATS should always be executed in the on-chip RAM.
2. To ensure that the MAT that has been switched to is accessible, execute four NOP instructions
3. If an interrupt has occurred during switching, there is no guarantee of which memory MAT is
4. After the MATs have been switched, take care because the interrupt vector table will also have
in the on-chip RAM immediately after writing to FMATS in the on-chip RAM (this prevents
access to the flash memory during MAT switching).
being accessed. Always mask the maskable interrupts before switching between MATs. In
addition, configure the system so that NMI interrupts do not occur during MAT switching.
been switched. If interrupt processing is to be the same before and after MAT switching,
transfer the interrupt-processing routines to the on-chip RAM and set the WEINTE bit in
FCCS to place the interrupt-vector table in the on-chip RAM.
Switching between User MAT and User Boot MAT
Error occurred
programming/erasing
programming/erasing disabled,
enabled,
Error protection mode
Program mode
Read disabled,
Erase mode
Read enabled,
Figure 20.16 Transitions to Error Protection State
FLER = 1
FLER = 0
Software standby mode
software standby mode
= 0 or
Cancel
= 0
programming/erasing disabled,
Error protection mode
(Software standby)
Program/erase interface
register is in its initial state.
programming/erasing disabled,
Rev.2.00 May. 28, 2009 Page 605 of 732
Read disabled,
= 0 or
= 0
(Hardware protection)
FLER = 1
Reset or hardware
Read disabled,
FLER = 0
standby
Program/erase interface
register is in its initial state.
REJ09B0059-0200