DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 145

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

16-Bit Access Space:
Figure 6.4 illustrates data alignment control for the 16-bit access space. With the 16-bit access
space, the upper data bus (D15 to D8/AD15 to AD8) and lower data bus (D7 to D0/AD7 to AD0)
are used for accesses. The amount of data that can be accessed at one time is one byte or one word.
A longword access is executed as two word accesses.
In byte access, whether the upper or lower data bus is used is determined by whether the address is
even or odd. The upper data bus is used for even addresses, and the lower data bus for odd
addresses.
Figure 6.4 Access Sizes and Data Alignment Control (16-Bit Access Space)
Byte size
Byte size
Word size
Longword
size
• Even address
• Odd address
1st bus cycle
2nd bus cycle
AD15
D15/
Upper data bus
Rev.2.00 May. 28, 2009 Page 105 of 732
D8/
AD8
AD7
D7/
Lower data bus
REJ09B0059-0200
D0/
AD0