DF2338VFC25IV Renesas Electronics America, DF2338VFC25IV Datasheet - Page 180

• Manufacturer Part Number: DF2338VFC25IV
• Description: MCU 3V 256K I-TEMP PB-FREE 144-Q
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2338VFC25IV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 106
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

6.2.8
RTCNT is an 8-bit readable/writable up-counter.
RTCNT counts up using the internal clock selected by bits CKS2 to CKS0 in DRAMCR.
When RTCNT matches RTCOR (compare match), the CMF flag in DRAMCR is set to 1 and
RTCNT is cleared to H'00. If the RFSHE bit in DRAMCR is set to 1 at this time, a refresh cycle is
started. Also, if the CMIE bit in DRAMCR is set to 1, a compare match interrupt (CMI) is
generated.
RTCNT is initialized to H'00 by a reset, and in hardware standby mode. It is not initialized in
software standby mode.
6.2.9
RTCOR is an 8-bit readable/writable register that sets the period for compare match operations
with RTCNT.
The values of RTCOR and RTCNT are constantly compared, and if they match, the CMF flag in
DRAMCR is set to 1 and RTCNT is cleared to H'00.
RTCOR is initialized to H'FF by a reset, and in hardware standby mode. It is not initialized in
software standby mode.
Rev.4.00 Sep. 07, 2007 Page 148 of 1210
REJ09B0245-0400
Bit
Initial value :
R/W
Bit
Initial value :
R/W
Refresh Timer Counter (RTCNT)
Refresh Time Control Register (RTCOR)
:
:
:
:
R/W
R/W
7
0
7
1
R/W
R/W
6
0
6
1
R/W
R/W
5
0
5
1
R/W
R/W
4
0
4
1
R/W
R/W
0
1
3
3
R/W
R/W
2
0
2
1
R/W
R/W
1
0
1
1
R/W
R/W
0
0
0
1