HD6417032F20V Renesas Electronics America, HD6417032F20V Datasheet - Page 204
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: 204 of 689
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Section 8 Bus State Controller (BSC)
The maximum number of states from BREQ input to bus release are used when B is a cycle
comprising the maximum number of states for which the bus is not released; the number of states
is the maximum number of states for which bus is not released + approx. 4.5 states.
The maximum number of states for which the bus is not released requires careful investigation.
1. Cycles in which bus is not released
Rev. 7.00 Jan 31, 2006 page 176 of 658
REJ09B0272-0700
a.
b. TAS instruction read cycle and write cycle
The bus is never released during one bus cycle. For example, in the case of a longword
read (or write) in 8-bit ordinary space, one bus cycle consists of 4 memory accesses to 8-bit
ordinary space, as shown in figure 8.44. The bus is not released between these accesses.
Assuming one memory access to require 2 states, the bus is not released for a period of 8
states.
The bus is never released during a TAS instruction read cycle and write cycle (figure 8.45).
The TAS instruction read cycle and write cycle should be regarded as one bus cycle during
which the bus is not released.
One bus cycle
Figure 8.43 When BREQ
Figure 8.45 TAS Instruction Read Cycle and Write Cycle
Bus cycle
BREQ
BACK
CK
t
BRQS
A
Figure 8.44 One Bus Cycle
8 bits 8 bits
Read cycle
Cycle during which bus is
not released (1 bus cycle)
Cycle during which
bus is not released
BREQ is Input without Satisfying t
BREQ
BREQ
B
8 bits 8 bits
Write cycle
t
BACD1
Bus release
BRQS
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