DF2398F20V Renesas Electronics America, DF2398F20V Datasheet - Page 670

• Manufacturer Part Number: DF2398F20V
• Description: IC H8S/2300 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398F20V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• For Use With: YR0K42378FC000BA - KIT EVAL FOR H8S/2378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

19.18.3 Erase Mode
Flash memory erasing should be performed block by block following the procedure shown in the erase/erase-verify
flowchart (single-block erase) shown in figure 19-49.
For the wait times (x, y, z, , ß,
after bits are set or cleared in flash memory control register 1 (FLMCR1) and
the maximum number of programming operations (N), see section 22.3.6, Flash Memory Characteristics.
To perform data or program erasure, make a 1 bit setting for the flash memory area to be erased in erase block register 1 or
2 (EBR1 or EBR2) at least (x) s after setting the SWE bit to 1 in flash memory control register 1 (FLMCR1). Next, the
watchdog timer is set to prevent overerasing in the event of program runaway, etc. Set a value greater than (y + z +
+ ß)
ms as the WDT overflow period. After this, preparation for erase mode (erase setup) is carried out by setting the ESU bit
in FLMCR1, and after the elapse of (y) s or more, the operating mode is switched to erase mode by setting the E bit in
FLMCR1. The time during which the E bit is set is the flash memory erase time. Ensure that the erase time does not
exceed (z) ms.
Note: With flash memory erasing, prewriting (setting all data in the memory to be erased to 0) is not necessary before
starting the erase procedure.
19.18.4 Erase-Verify Mode
In erase-verify mode, data is read after memory has been erased to check whether it has been correctly erased.
After the elapse of the erase time, erase mode is exited (the E bit in FLMCR1 is cleared to 0, then the ESU bit in FLMCR1
is cleared to 0 at least ( ) s later), the watchdog timer is cleared after the elapse of ( ) s or more, and the operating
mode is switched to erase-verify mode by setting the EV bit in FLMCR1. Before reading in erase-verify mode, a dummy
write of H'FF data should be made to the addresses to be read. The dummy write should be executed after the elapse of ( )
s or more. When the flash memory is read in this state (verify data is read in 16-bit units), the data at the latched address
is read. Wait at least ( ) s after the dummy write before performing this read operation. If the read data has been erased
(all 1), a dummy write is performed to the next address, and erase-verify is performed. If the read data has not been erased,
set erase mode again, and repeat the erase/erase-verify sequence in the same way. However, ensure that the erase/erase-
verify sequence is not repeated more than (N) times. When verification is completed, exit erase-verify mode, and wait for
at least ( ) s. If erasure has been completed on all the erase blocks, clear the SWE bit in FLMCR1 to 0 and wait for at
least ( ) s. If there are any unerased blocks, make a 1 bit setting for the flash memory area to be erased, and repeat the
erase/erase-verify sequence in the same way.
Rev.6.00 Oct.28.2004 page 640 of 1016
REJ09B0138-0600H