DF2218BR24V Renesas Electronics America, DF2218BR24V Datasheet - Page 404

• Manufacturer Part Number: DF2218BR24V
• Description: IC H8S/2218 MCU FLASH 112-LFBGA
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2218BR24V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 24MHz
• Connectivity: SCI, SmartCard, USB
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-LFBGA
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)3DK2218-SS - KIT DEV H8S/2218 WINDOWS SIDESHW3DK2218 - DEV EVAL KIT H8S/2218
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

10.5.3
If bits CKS0 to CKS2 in TCSR are written to while the WDT is operating, errors could occur in
the incrementation. Software must be used to stop the watchdog timer (by clearing the TME bit to
0) before changing the value of bits CKS0 to CKS2.
10.5.4
If the mode is switched from watchdog timer to interval timer while the WDT is operating, errors
could occur in the incrementation. Software must be used to stop the watchdog timer (by clearing
the TME bit to 0) before switching the mode.
10.5.5
This LSI is not reset internally if TCNT overflows while the RSTE bit is cleared to 0 during
watchdog timer operation, however TCNT and TCSR of the WDT are reset.
TCNT, TCSR, or RSTCR cannot be written to for 132 states following an overflow. During this
period, any attempt to read the WOVF flag is not acknowledged. Accordingly, wait 132 states after
overflow to write 0 to the WOVF flag for clearing.
10.5.6
When the OVF flag setting conflicts with the OVF flag reading in interval timer mode, writing 0 to
the OVF bit may not clear the flag even though the OVF bit has been read while it is 1. If there is a
possibility that the OVF flag setting and reading will conflict, such as when the OVF flag is polled
with the interval timer interrupt disabled, read the OVF bit while it is 1 at least twice before
writing 0 to the OVF bit to clear the flag.
Rev.7.00 Dec. 24, 2008 Page 348 of 698
REJ09B0074-0700
Changing Value of CKS2 to CKS0
Switching between Watchdog Timer Mode and Interval Timer Mode
Internal Reset in Watchdog Timer Mode
OVF Flag Clearing in Interval Timer Mode