HD64F3048VTF8 Renesas Electronics America, HD64F3048VTF8 Datasheet - Page 222

• Manufacturer Part Number: HD64F3048VTF8
• Description: IC H8 MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of HD64F3048VTF8

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 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: HD64F3048VX8

Section 7 Refresh Controller
Rev. 7.00 Sep 21, 2005 page 196 of 878
REJ09B0259-0700
If a bus cycle is prolonged by insertion of wait states, the first refresh request is held, as in the
bus-released state.
If there is contention with a bus request from an external bus master when making a transition
to software standby mode, a one-state bus-released state may occur immediately before the
transition to software standby mode (see figure 7.25).
When using software standby mode, clear the BRLE bit to 0 in BRCR before executing the
SLEEP instruction.
When making a transition to self-refresh mode, the strobe waveform output may not be
guaranteed due to the same kind of contention. This, too, can be prevented by clearing the
BRLE bit to 0 in BRCR.
Figure 7.25 Contention between Bus-Released State and Software Standby Mode
BREQ
BACK
Address bus
Strobe
RFSH
Refresh
request
BACK
Bus-released state
Figure 7.24 Refresh Cycles when Bus is Released
External bus
released state
Refresh cycle
Software standby mode
CPU cycle
Refresh cycle