DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 494

• Manufacturer Part Number: DF2357F20
• Description: IC H8S MCU FLASH 5V 128K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2357F20

• 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: 128KB (128K 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

H8S/2357 Group
Reset input
RES
Reset signal to entire system
WDTOVF *
Note: * The WDTOVF pin function is not available in the F-ZTAT version,
the H8S/2398, H8S/2394, H8S/2392 or H8S/2390.
Figure 13-9 Circuit for System Reset by WDTOVF Signal (Example)
13.5.5
Internal Reset in Watchdog Timer Mode
The H8S/2357 Group is not reset internally if TCNT overflows while the RSTE bit is cleared to 0 during watchdog timer
operation, but TCNT and TSCR of the WDT are reset.
TCNT, TCSR, and RSTCR cannot be written to while the WDTOVF signal* is low. Also note that a read of the WOVF
flag is not recognized during this period. To clear the WOVF falg, therefore, read RSTCSR after the WDTOVF signal*
goes high, then write 0 to the WOVF flag.
Note: * The WDTOVF pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392 or
H8S/2390.
Rev.6.00 Oct.28.2004 page 464 of 1016
REJ09B0138-0600H