HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 31

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Item
13.3.11 Bus Arbitration 490, 491 Description amended
Page
Revision (See Manual for Details)
There are two bus arbitration modes:
slave mode. In master mode the bus is held on a constant
basis, and is released to another device in response to a bus
request. In slave mode the bus is not held on a constant basis;
a bus request is issued each time an external bus cycle occurs,
and the bus is released again at the end of the access.
Master mode and slave mode can be specified by the external
mode pins.
external mode pin settings. In master mode and slave mode,
the bus goes to the high-impedance state when not being held.
description, an external device that issues bus requests is also
referred to as a slave.
…
To prevent incorrect operation of connected devices when the
bus is transferred between master and slave, all bus control
signals are negated before the bus is released. When
mastership of the bus is received, also, bus control signals
begin driving the bus from the negated state. Since signals are
driven to the same value by the master and slave exchanging
the bus, output buffer collisions can be avoided.
Instead of a slave mode chip. In the following
See Appendix C, Mode Pin Settings, for the
Rev.4.00 Oct. 10, 2008 Page xxix of xcviii
REJ09B0370-0400
master mode, and