D12674RVFQ33D Renesas Electronics America, D12674RVFQ33D Datasheet - Page 307
D12674RVFQ33D
Manufacturer Part Number
D12674RVFQ33D
Description
MCU 3V 0K I-TEMP 144-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2600r
Datasheet
1.D12674RVFQ33V.pdf
(981 pages)
Specifications of D12674RVFQ33D
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 Type
ROMless
Ram Size
32K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 12x10b; D/A 4x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Other names
HD6412674RVFQ33D
HD6412674RVFQ33D
HD6412674RVFQ33D
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
D12674RVFQ33DV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
- Current page: 307 of 981
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6.12
This LSI has a bus arbiter that arbitrates bus mastership operations (bus arbitration).
There are four bus masters—the CPU, DTC, DMAC, and EXDMAC—that perform read/write
operations when they have possession of the bus. Each bus master requests the bus by means of a
bus request signal. The bus arbiter determines priorities at the prescribed timing, and permits use
of the bus by means of a bus request acknowledge signal. The selected bus master then takes
possession of the bus and begins its operation.
6.12.1
The bus arbiter detects the bus masters’ bus request signals, and if the bus is requested, sends a bus
request acknowledge signal to the bus master. If there are bus requests from more than one bus
master, the bus request acknowledge signal is sent to the one with the highest priority. When a bus
master receives the bus request acknowledge signal, it takes possession of the bus until that signal
is canceled.
The order of priority of the bus mastership is as follows:
An internal bus access by internal bus masters except the EXDMAC and external bus release, a
refresh when the CBRM bit is 0, and an external bus access by the EXDMAC can be executed in
parallel.
If an external bus release request, a refresh request, and an external access by an internal bus
master occur simultaneously, the order of priority is as follows:
As a refresh when the CBRM bit in REFCR is cleared to 0 and an external access other than to
DRAM space by an internal bus master can be executed simultaneously, there is no relative order
of priority for these two operations.
6.12.2
Even if a bus request is received from a bus master with a higher priority than that of the bus
master that has acquired the bus and is currently operating, the bus is not necessarily transferred
immediately. There are specific timings at which each bus master can relinquish the bus.
(High) EXDMAC > DMAC > DTC > CPU (Low)
(High) Refresh > EXDMAC > External bus release (Low)
(High) External bus release > External access by internal bus master except EXDMAC (Low)
Operation
Bus Transfer Timing
Bus Arbitration
Rev. 3.00 Mar 17, 2006 page 255 of 926
Section 6 Bus Controller (BSC)
REJ09B0283-0300
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