HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 148

• 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: -

8.4
In external memory space, strobe signal is output based on the assumption of a directly connected
SRAM. The external memory space is allocated to the following areas:
• Area 0 (when MD2–MD0 are 000 or 001)
• Area 1 (when the DRAM enable bit (DRAME) of the BCR is 0)
• Areas 2–4
• Area 5 (space where address A27 is 1)
• Area 6 (when the multiplexed I/O enable bit (IOE) bit of the BCR is 0, or space where address
• Area 7 (space where address A27 is 0)
8.4.1
The bus cycle for external memory space access is 1 or 2 states. The number of states is controlled
with the wait states by the settings of wait state control registers 1–3 (WCR1–WCR3). For details,
see section 8.4.2., Wait State Control. Figures 8.11 and 8.12 illustrate the basic timing of external
memory space access.
128 RENESAS
A27 is 1)
Figure 8.11 Basic Timing of External Memory Space Access (1-state read timing)
Accessing External Memory Space
Basic Timing
AD15–AD0
A21–A0
(Read)
(Read)
CSn
RD
CK
T1