HD64F2676VFC33 Renesas Electronics America, HD64F2676VFC33 Datasheet - Page 303

• Manufacturer Part Number: HD64F2676VFC33
• Description: IC H8S MCU FLASH 256K 144-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of HD64F2676VFC33

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 33MHz
• Connectivity: IrDA, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 103
• 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 12x10b; D/A 4x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

6.11.1
In externally expanded mode, the bus can be released to an external device by setting the BRLE
bit to 1 in BCR. Driving the BREQ pin low issues an external bus request to this LSI. When the
BREQ pin is sampled, at the prescribed timing the BACK pin is driven low, and the address bus,
data bus, and bus control signals are placed in the high-impedance state, establishing the external
bus released state.
In the external bus released state, internal bus masters except the EXDMAC can perform accesses
using the internal bus. When an internal bus master wants to make an external access, it
temporarily defers initiation of the bus cycle, and waits for the bus request from the external bus
master to be canceled. If a refresh request is generated in the external bus released state, or if a
SLEEP instruction is executed to place the chip in software standby mode or all-module-clocks-
stopped mode, refresh control and software standby or all-module-clocks-stopped control is
deferred until the bus request from the external bus master is canceled.
If the BREQOE bit is set to 1 in BCR, the BREQO pin can be driven low when any of the
following requests are issued, to request cancellation of the bus request externally.
When the BREQ pin is driven high, the BACK pin is driven high at the prescribed timing and the
external bus released state is terminated.
If an external bus release request and external access occur simultaneously, the order of priority is
as follows:
If a refresh request and external bus release request occur simultaneously, the order of priority is
as follows:
When an internal bus master wants to perform an external access
When a refresh request is generated
When a SLEEP instruction is executed to place the chip in software standby mode or all-
module-clocks-stopped mode
(High) External bus release > External access by internal bus master (Low)
(High) Refresh > External bus release (Low)
Operation
Rev. 3.00 Mar 17, 2006 page 251 of 926
Section 6 Bus Controller (BSC)
REJ09B0283-0300