DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 468

• Manufacturer Part Number: DF2148RTE20IV
• Description: MCU 5V 128K I-TEMP,PB-FREE, 100-
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148RTE20IV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 14 Watchdog Timer (WDT)
Caution is therefore required when using WDT1 as the realtime clock counter.
No error occurs in the counter value while WDT1 is operating in the same mode.
14.5.6
To clear OVF flag in WOVI handling routine, read TCSR when OVF = 1, then write with 0 to
OVF, as stated above. When WOVI is masked and OVF flag is poling, if contention between OVF
flag set and TCSR read is occurred, OVF = 1 is read but OVF can not be cleared by writing with 0
to OVF.
In this case, reading TCSR when OVF = 1 two times meet the requirements of OVF clear
condition. Please read TCSR when OVF = 1 two times before writing with 0 to OVF.
Rev. 4.00 Sep 27, 2006 page 422 of 1130
REJ09B0327-0400
LOOP
OVF Flag Clear Condition
BTST.B
BEQ
MOV.B
MOV.W
MOV.W
#7, @TCSR
LOOP
@TCSR, R0L
#H'A521, R0
R0,@TCSR
; OVF flag read
; if OVF=1, exit from loop
; OVF=1 read again
; OVF flag clear
;
: