HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 167

• Manufacturer Part Number: HD6477021X20V
• Description: MCU 5V 32K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7020r

Specifications of HD6477021X20V

• Core Processor: SH-1
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

•
AD15–
A21–
RAS Up Mode: When the RASD bit is cleared to 0, the RAS signal reverts to high whenever a
DRAM access pauses for access to another space. Burst operation continues only while
DRAM access is continuous. Figure 8.28 shows the timing when an external memory space
access occurs during burst operation in the RAS up mode.
RAS
CAS
AD0
WR
CK
A0
T
p
Row address
T r
DRAM access
address 1
Column
Figure 8.27 RAS Down Mode
T
c
Data 1
address 2
Column
T
c
External memory
Data 2
space access
External
memory
memory data
T1
External
address 3
Column
DRAM access
T
c
Data 3
address 4
Column
T
RENESAS 147
c
Data 4