HD6413007F20 Renesas Electronics America, HD6413007F20 Datasheet - Page 212
HD6413007F20
Manufacturer Part Number
HD6413007F20
Description
IC H8 MCU ROMLESS 5V 100QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Datasheet
1.D13007F20V.pdf
(798 pages)
Specifications of HD6413007F20
Core Processor
H8/300H
Core Size
16-Bit
Speed
20MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
35
Program Memory Type
ROMless
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-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
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6. Bus Controller
6.10
The bus controller has a built-in bus arbiter that arbitrates between different bus masters. There are
four bus masters: the CPU, DMA controller (DMAC), DRAM interface, and an external bus
master. When a bus master has the bus right it can carry out read, write, or refresh access. Each
bus master uses a bus request signal to request the bus right. At fixed times the bus arbiter
determines priority and uses a bus acknowledge signal to grant the bus to a bus master, which can
the operate using the bus.
The bus arbiter checks whether the bus request signal from a bus master is active or inactive, and
returns an acknowledge signal to the bus master. When two or more bus masters request the bus,
the highest-priority bus master receives an acknowledge signal. The bus master that receives an
acknowledge signal can continue to use the bus until the acknowledge signal is deactivated.
The bus master priority order is:
The bus arbiter samples the bus request signals and determines priority at all times, but it does not
always grant the bus immediately, even when it receives a bus request from a bus master with
higher priority than the current bus master. Each bus master has certain times at which it can
release the bus to a higher-priority bus master.
6.10.1
CPU: The CPU is the lowest-priority bus master. If the DMAC, DRAM interface, or an external
bus master requests the bus while the CPU has the bus right, the bus arbiter transfers the bus right
to the bus master that requested it. The bus right is transferred at the following times:
• The bus right is transferred at the boundary of a bus cycle. If word data is accessed by two
• If another bus master requests the bus while the CPU is performing internal operations, such as
• If another bus master requests the bus while the CPU is in sleep mode, the bus right is
Rev.5.00 Sep. 12, 2007 Page 182 of 764
REJ09B0396-0500
consecutive byte accesses, however, the bus right is not transferred between the two byte
accesses.
executing a multiply or divide instruction, the bus right is transferred immediately. The CPU
continues its internal operations.
transferred immediately.
(High)
Bus Arbiter
Operation
External bus master > DRAM interface > DMAC > CPU
(Low)
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