HD6417032F20V Renesas Electronics America, HD6417032F20V Datasheet - Page 197
HD6417032F20V
Manufacturer Part Number
HD6417032F20V
Description
SH1 ROMLESS LEAD FREE
Manufacturer
Renesas Electronics America
Series
SuperH® SH7030r
Datasheet
1.HD6417034AFI20.pdf
(689 pages)
Specifications of HD6417032F20V
Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
112-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6417032F20V
Manufacturer:
TI
Quantity:
201
- Current page: 197 of 689
- Download datasheet (5Mb)
Section 8 Bus State Controller (BSC)
8.10
Bus Arbitration
The SuperH microcomputer can release the bus to external devices when they request the bus. It
has two internal bus masters, the CPU and the DMAC. Priorities for releasing the bus for these
two are as follows.
Bus request from external device > refresh > DMAC > CPU
Thus, an external device has priority when it generates a bus request, even when the DMAC is
carrying out a burst transfer.
Note that when a refresh request is generated while the bus is released to an external device,
BACK goes high and the bus can be acquired to perform refreshing upon receipt of a BREQ =
high response from the external device. Input all bus requests from external devices to the BREQ
pin. The signal indicating that the bus has been released is output from the BACK pin. Figure 8.35
illustrates the bus release procedure.
External device
SuperH
Bus request
BREQ = low
BREQ received
Strobe pin:
High-level output
Address, data, strobe pin:
BACK
acknowledge
BACK = low
High impedance
Bus release response
Bus acquisition
Bus released
Figure 8.35 Bus Release Procedure
Rev. 7.00 Jan 31, 2006 page 169 of 658
REJ09B0272-0700
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