DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 460

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• 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: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148ATE20; HD64F2148ATE20

Section 14 Watchdog Timer (WDT)
Bit 4
PSS
0
1
Note:
14.2.3
Only bit 3 is described here. For details on functions not related to the watchdog timer, see
sections 3.2.2 and 5.2.1, System Control Register (SYSCR), and the descriptions of the relevant
modules.
Bit 3—External Reset (XRST): Indicates the reset source. When the watchdog timer is used, a
reset can be generated by watchdog timer overflow in addition to external reset input. XRST is a
Rev. 4.00 Sep 27, 2006 page 414 of 1130
REJ09B0327-0400
Bit
Initial value
Read/Write
WDT1 input clock selection
* The overflow period is the time from when TCNT starts counting up from H'00 until
System Control Register (SYSCR)
Bit 2
CKS2
0
1
0
1
overflow occurs.
CS2E
R/W
Bit 1
CKS1
0
1
0
1
0
1
0
1
7
0
IOSE
R/W
Bit 0
CKS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
6
0
INTM1
R
5
0
Clock
/2 (Initial value) 25.6 µs
/64
/128
/512
/2048
/8192
/32768
/131072
SUB/2
SUB/4
SUB/8
SUB/16
SUB/32
SUB/64
SUB/128
SUB/256
INTM0
R/W
4
0
XRST
Overflow Period * (when
and
819.2 µs
1.6 ms
6.6 ms
26.2 ms
104.9 ms
419.4 ms
1.68 s
15.6 ms
31.3 ms
62.5 ms
125 ms
250 ms
500 ms
1 s
2 s
R
3
1
Description
SUB
NMIEG
= 32.768 kHz)
R/W
2
0
R/W
HIE
1
0
= 20 MHz
RAME
R/W
0
1