R8A77850ADBGV#RD0Z Renesas Electronics America, R8A77850ADBGV#RD0Z Datasheet - Page 796

• Manufacturer Part Number: R8A77850ADBGV#RD0Z
• Description: IC SUPERH MPU ROMLESS 436-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77850ADBGV#RD0Z

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 600MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 108
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1 V ~ 1.2 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 436-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

16. Watchdog Timer and Reset (WDT)
16.3.2
WDTCSR is a 32-bit readable/writable register comprising timer mode-selecting bits and overflow
flags.
WDTCSR should be written to as a longword unit, with H'A5 in the most significant byte. The
value read from this byte is always H'00. WDTCSR is only rest by a power-on reset caused by the
PRESET pin.
Rev.1.00 Jan. 10, 2008 Page 764 of 1658
REJ09B0261-0100
Initial value:
Initial value:
Bit
31 to 24
23 to 8
7
6
R/W:
R/W:
Bit:
Bit:
Watchdog Timer Control/Status Register (WDTCSR)
Bit Name
(Code for
writing)
⎯
TME
WT/IT
R/W
31
15
⎯
R
0
0
R/W
30
14
⎯
R
0
0
R/W
29
13
⎯
R
0
0
Initial
Value
All 0
All 0
0
0
Code for writing (H'A5)
R/W
28
12
⎯
R
0
0
R/W
R/W
R/W
R
R/W
R/W
27
11
⎯
R
0
0
R/W
26
10
⎯
R
0
0
Description
Code for writing (H'A5)
These bits are always read as H'00. When writing to
this register, the value written to these bits must be
H'A5.
Reserved
These bits are always read as 0. The write value
should always be 0.
Timer Enable
Starts or stops the timer operation.
0: Stops counting up.
1: Starts counting up.
Timer Mode Select
Specifies whether the WDT is used as a watchdog
timer or interval timer. Up counting may not be
performed correctly if this bit is modified while the
WDT is running.
0: Interval timer mode
1: Watchdog timer mode
R/W
25
⎯
R
0
9
0
R/W
24
⎯
R
0
8
0
R/W
TME
23
⎯
R
0
7
0
WT/IT
R/W
22
⎯
R
0
6
0
RSTS
R/W
21
⎯
R
0
5
0
WOVF
R/W
20
⎯
R
0
4
0
IOVF
R/W
19
⎯
R
0
3
0
18
⎯
⎯
R
R
0
2
0
17
⎯
⎯
R
R
0
1
0
16
⎯
⎯
R
R
0
0
0