HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 181

• 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: -

8.11
8.11.1
Condition: When DRAM (long-pitch mode) is used and manual reset is performed.
The low width of RAS output may be shorter than usual in rese + (2.5tcyc 1.5tcyc), causing the
specified value (tRAS) of DRAM not to be satisfied.
There are no problems regarding operations except for the above conditions.
There are the following four cases (Figure 8.38 to Figure 8.41) for the output states of DRAM
control signals (RAS, CAS, and WR) corresponding to RES latch timing. Actual output levels are
shown by solid lines (not by dashed lines).
Usage Notes
Usage Notes on Manual Reset
Corresponding DRAM conditions: long pitch/normal mode
BACK
Trigger OK
Trigger NG
D Q
D Q
Q
Q
long pitch/high-speed page mode
BACK
D Q
Q
RENESAS 161