HD6473258P10 Renesas Electronics America, HD6473258P10 Datasheet - Page 201

• Manufacturer Part Number: HD6473258P10
• Description: IC H8 MCU OTP 32K 64DIP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/325r

Specifications of HD6473258P10

• Core Processor: H8/300
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI, UART/USART
• Number Of I /o: 53
• 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: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-DIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Peripherals: -

(3) Line Break Detection: When the RxD pin receives a continuous stream of 0’s in asynchro-
nous mode (line-break state), a framing error occurs because the SCI detects a 0 stop bit. The value
H’00 is transferred from the RSR to the RDR. Software can detect the line-break state as a framing
error accompanied by H’00 data in the RDR.
The SCI continues to receive data, so if the FER bit is cleared to 0 another framing error will occur.
(4) Sampling Timing and Receive Margin in Asynchronous Mode: The serial clock used by
the SCI in asynchronous mode runs at 16 times the baud rate. The falling edge of the start bit is
detected by sampling the RxD input on the falling edge of this clock. After the start bit is detected,
each bit of receive data in the frame (including the start bit, parity bit, and stop bit or bits) is
sampled on the rising edge of the serial clock pulse at the center of the bit. See figure 9-6.
It follows that the receive margin can be calculated as in equation (1).
When the absolute frequency deviation of the clock signal is 0 and the clock duty factor is 0.5, data
can theoretically be received with distortion up to the margin given by equation (2). This is a
theoretical limit, however. In practice, system designers should allow a margin of 20% to 30%.
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