HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 149

• 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: -

High-level duties of 35% and 50% can be selected for the RD signal using the RD duty bit
(RDDTY) of the BCR. When RDDTY is set to 1, the high-level duty is 35% of the T1 state,
enabling longer access times for external devices. Only set to 1 when the operating frequency is a
minimum of 10 MHz.
8.4.2
The number of external memory space access states and the insertion of wait states can be
controlled using the WCR1–WCR3 bits. The bus cycles that can be controlled are the CPU read
cycle and the DMAC dual mode read cycle. The bus cycle that can be controlled using the WCR2
is the DMAC single-mode read/write cycle.
Table 8.8 shows the number of states and number of wait states in the access cycles to external
memory spaces.
Read
Write
Figure 8.12 Basic Timing of External Memory Space Access (2-state read timing)
Wait State Control
WRH, WRL
AD15–AD0
AD15–AD0
A21–A0
CSn
RD
CK
When
RDDTY = 1
T1
When
RDDTY = 0
T2
RENESAS 129