HD64F3048VTF8 Renesas Electronics America, HD64F3048VTF8 Datasheet - Page 471
HD64F3048VTF8
Manufacturer Part Number
HD64F3048VTF8
Description
IC H8 MCU FLASH 128K 100-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Datasheet
1.HD64F3048F16.pdf
(907 pages)
Specifications of HD64F3048VTF8
Core Processor
H8/300H
Core Size
16-Bit
Speed
8MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
70
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 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
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
HD64F3048VX8
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12.3
Operations when the WDT is used as a watchdog timer and as an interval timer are described
below.
12.3.1
Figure 12.4 illustrates watchdog timer operation. To use the WDT as a watchdog timer, set the
WT/IT and TME bits to 1 in TCSR. Software must prevent TCNT overflow by rewriting the
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 chip is internally reset for a duration of 518 states.
The watchdog reset signal can be externally output from the RESO pin to reset external system
devices. The reset signal is output externally for 132 states. External output can be enabled or
disabled by the RSTOE bit in RSTCSR.
A watchdog reset has the same vector as a reset generated by input at the RES pin. Software can
distinguish a RES reset from a watchdog reset by checking the WRST bit in RSTCSR.
If a RES reset and a watchdog reset occur simultaneously, the RES reset takes priority.
H'FF
TCNT count
value
H'00
Internal
reset signal
RESO
Watchdog Timer Operation
Operation
Start
Figure 12.4 Watchdog Timer Operation
H'00 written
in TCNT
OVF = 1
WDT overflow
Rev. 7.00 Sep 21, 2005 page 445 of 878
132 states
Reset
518 states
TME set to 1
Section 12 Watchdog Timer
H'00 written
in TCNT
REJ09B0259-0700
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