DF3026X25V Renesas Electronics America, DF3026X25V Datasheet - Page 386
![MCU 3V 256K PB-FREE 100-TQFP](/photos/28/61/286123/100-tqfp__100-vqfp_sml.jpg)
DF3026X25V
Manufacturer Part Number
DF3026X25V
Description
MCU 3V 256K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Specifications of DF3026X25V
Core Processor
H8/300H
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
PWM, WDT
Number Of I /o
70
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF3026X25V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Section 11 Watchdog Timer
11.3
Operations when the WDT is used as a watchdog timer and as an interval timer are described
below.
11.3.1
Figure 11.4 illustrates watchdog timer operation. To use the WDT as a watchdog timer, set the
WT/
TCNT value (normally by writing H'00) before overflow occurs. If TCNT fails to be rewritten and
overflows due to a system crash etc., the H8/3024 is internally reset for a duration of 518 states.
The watchdog reset signal can be externally output from the
devices. The reset signal is output externally for 132 states. External output can be enabled or
disabled by the RSTOE bit in RSTCSR. Note that there is no
chip flash memory.
A watchdog reset has the same vector as a reset generated by input at the
distinguish a
If a
Rev. 2.00 Sep 20, 2005 page 346 of 800
REJ09B0260-0200
R E S
I T
and TME bits to 1 in TCSR. Software must prevent TCNT overflow by rewriting the
H'FF
TCNT count
value
H'00
Internal
reset signal
RESO
reset and a watchdog reset occur simultaneously, the
Operation
Watchdog Timer Operation
R E S
reset from a watchdog reset by checking the WRST bit in RSTCSR.
Figure 11.4 Operation in Watchdog Timer Mode
Start
H'00 written
in TCNT
OVF = 1
WDT overflow
132 states
Reset
518 states
R E S O
R E S O
R E S
TME set to 1
reset takes priority.
pin to reset external system
pin in the versions with on-
R E S
H'00 written
in TCNT
pin. Software can
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