HD64F3026X25 Renesas Electronics America, HD64F3026X25 Datasheet - Page 396

• Manufacturer Part Number: HD64F3026X25
• Description: MCU 3V 256K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of HD64F3026X25

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 12 Serial Communication Interface
12.2
12.2.1
RSR is the register that receives serial data.
Bit
The SCI loads serial data input at the RxD pin into RSR in the order received, LSB (bit 0) first,
thereby converting the data to parallel data. When one byte of data has been received, it is
automatically transferred to RDR. The CPU cannot read or write RSR directly.
12.2.2
RDR is the register that stores received serial data.
When the SCI has received one byte of serial data, it transfers the received data from RSR into
RDR for storage, completing the receive operation. RSR is then ready to receive the next data.
This double-buffering allows data to be received continuously.
RDR is a read-only register. Its contents cannot be modified by the CPU. RDR is initialized to
H'00 by a reset and in standby mode.
Rev. 2.00 Sep 20, 2005 page 356 of 800
REJ09B0260-0200
Read/Write
Bit
Initial value
Read/Write
Register Descriptions
Receive Shift Register (RSR)
Receive Data Register (RDR)
R
7
0
—
7
R
6
0
—
6
R
0
5
—
5
R
0
4
—
4
R
3
0
—
3
R
0
2
—
2
1
R
0
—
1
—
0
0
R
0