DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 138

• Manufacturer Part Number: DF2357F20
• Description: IC H8S MCU FLASH 5V 128K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2357F20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

6.2
6.2.1
Modes 5 to 7
Mode 4
ABWCR is an 8-bit readable/writable register that designates each area for either 8-bit access or 16-bit access.
ABWCR sets the data bus width for the external memory space. The bus width for on-chip memory and internal I/O
registers is fixed regardless of the settings in ABWCR.
After a power-on reset and in hardware standby mode, ABWCR is initialized to H'FF in modes 5 to 7,*
mode 4. It is not initialized by a manual reset*
Notes: 1. In ROMless version, modes 6 and 7 are not available.
Bits 7 to 0—Area 7 to 0 Bus Width Control (ABW7 to ABW0): These bits select whether the corresponding area is to
be designated for 8-bit access or 16-bit access.
Rev.6.00 Oct.28.2004 page 108 of 1016
REJ09B0138-0600H
Bit
Initial value :
R/W
Initial value :
R/W
2. Manual reset is only supported in the H8S/2357 ZTAT.
Register Descriptions
Bus Width Control Register (ABWCR)
Bit n
ABWn
0
1
:
:
:
ABW7
R/W
R/W
7
1
0
Description
Area n is designated for 16-bit access
Area n is designated for 8-bit access
ABW6
R/W
R/W
6
1
0
ABW5
R/W
R/W
5
1
0
2
or in software standby mode.
ABW4
R/W
R/W
4
1
0
ABW3
R/W
R/W
3
1
0
ABW2
R/W
R/W
2
1
0
ABW1
R/W
R/W
1
1
0
ABW0
R/W
R/W
0
1
0
1
and to H'00 in
(n = 7 to 0)