DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 219

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 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: -
• Other names: HD64F2148ATE20; HD64F2148ATE20

6.5
6.5.1
With this LSI, external space area 0 can be designated as burst ROM space, and burst ROM
interfacing can be performed.
External space can be designated as burst ROM space by means of the BRSTRM bit in BCR.
Consecutive burst accesses of a maximum of 4 words or 8 words can be performed for CPU
instruction fetches only. One or two states can be selected for burst access.
6.5.2
The number of states in the initial cycle (full access) of the burst ROM interface is in accordance
with the setting of the AST bit. Also, when the AST bit is set to 1, wait state insertion is possible.
One or two states can be selected for the burst cycle, according to the setting of the BRSTS1 bit in
BCR. Wait states cannot be inserted.
When the BRSTS0 bit in BCR is cleared to 0, burst access of up to 4 words is performed; when
the BRSTS0 bit is set to 1, burst access of up to 8 words is performed.
The basic access timing for burst ROM space is shown in figures 6.14 (a) and (b). The timing
shown in figure 6.14 (a) is for the case where the AST and BRSTS1 bits are both set to 1, and that
in figure 6.14 (b) is for the case where both these bits are cleared to 0.
Burst ROM Interface
Overview
Basic Timing
Rev. 4.00 Sep 27, 2006 page 173 of 1130
Section 6 Bus Controller
REJ09B0327-0400