DF2398TE20 Renesas Electronics America, DF2398TE20 Datasheet - Page 481

• Manufacturer Part Number: DF2398TE20
• Description: IC H8S MCU FLASH 256K 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2398TE20; HD64F2398TE20

12.6.5
TCNT may increment erroneously when the internal clock is switched over. Table 12-5 shows the relationship between
the timing at which the internal clock is switched (by writing to the CKS1 and CKS0 bits) and the TCNT operation.
When the TCNT clock is generated from an internal clock, the falling edge of the internal clock pulse is detected. If clock
switching causes a change from high to low level, as shown in case 3 in table 12-5, a TCNT clock pulse is generated on
the assumption that the switchover is a falling edge. This increments TCNT.
The erroneous incrementation can also happen when switching between internal and external clocks.
Table 12-5 Switching of Internal Clock and TCNT Operation
Switching of Internal Clocks and TCNT Operation
No.
1
2
3
Timing of Switchover
by Means of CKS1
and CKS0 Bits
Switching from
low to low*
Switching from
low to high*
Switching from
high to low*
1
2
3
TCNT Clock Operation
Clock before
switchover
Clock after
switchover
TCNT clock
TCNT
Clock before
switchover
Clock before
switchover
Clock after
switchover
TCNT clock
TCNT
Clock after
switchover
TCNT clock
TCNT
N
N
N
CKS bit write
CKS bit write
N+1
N+1
CKS bit write
Rev.6.00 Oct.28.2004 page 451 of 1016
N+1
*
4
N+2
N+2
REJ09B0138-0600H