R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 919
R4F24278NVFQU
Manufacturer Part Number
R4F24278NVFQU
Description
MCU 512K/48K 2.7-5.5V 144-LQFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2400r
Datasheet
1.R4F24278NVFQU.pdf
(1482 pages)
Specifications of R4F24278NVFQU
Core Processor
H8S/2600
Core Size
16/32-Bit
Speed
33MHz
Connectivity
EBI/EMI, I²C, IrDA, SCI, Smart Card, SPI, SSU, UART/USART
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
98
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Eeprom Size
-
Ram Size
64K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 16x10b; D/A 2x8b
Oscillator Type
External
Operating Temperature
-20°C ~ 75°C
Package / Case
144-LQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
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H8S/2427, H8S/2427R, H8S/2425 Group
15.3
The WDT has the following three registers. To prevent accidental overwriting, TCSR, TCNT, and
RSTCSR have to be written to in a method different from normal registers. For details, refer to
section 15.6.1, Notes on Register Access.
• Timer counter (TCNT)
• Timer control/status register (TCSR)
• Reset control/status register (RSTCSR)
15.3.1
TCNT is an 8-bit readable/writable up-counter. TCNT is initialized to H'00 when the TME bit in
the timer control/status register (TCSR) is cleared to 0.
15.3.2
TCSR selects the clock source to be input to TCNT, and the timer mode.
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010
Bit
7
Bit Name
OVF
Register Descriptions
Timer Counter (TCNT)
Timer Control/Status Register (TCSR)
Initial Value
0
R/W
R/(W) *
Description
Overflow Flag
Indicates that TCNT has overflowed in interval
timer mode. Only a write of 0 is permitted, to clear
the flag.
[Setting condition]
When TCNT overflows in interval timer mode
(changes from H'FF to H'00)
When internal reset request generation is selected
in watchdog timer mode, OVF is cleared
automatically by the internal reset.
[Clearing conditions]
Cleared by reading TCSR when OVF = 1, then
writing 0 to OVF
Section 15 Watchdog Timer (WDT)
Page 889 of 1448
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