DF3052BX25V Renesas Electronics America, DF3052BX25V Datasheet - Page 170
DF3052BX25V
Manufacturer Part Number
DF3052BX25V
Description
MCU 5V 512K 100-TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Specifications of DF3052BX25V
Core Processor
H8/300H
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
70
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF3052BX25V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Section 6 Bus Controller
DMAC: When the DMAC receives an activation request, it requests the bus right from the bus
arbiter. If the DMAC is bus master and the refresh controller or an external bus master requests the
bus, the bus arbiter transfers the bus right from the DMAC to the bus master that requested the
bus. The bus right is transferred at the following times.
The bus right is transferred when the DMAC finishes transferring 1 byte or 1 word. A DMAC
transfer cycle consists of a read cycle and a write cycle. The bus right is not transferred between
the read cycle and the write cycle.
There is a priority order among the DMAC channels. For details see section 8.4.9, Multiple-
Channel Operation.
Refresh Controller: When a refresh cycle is requested, the refresh controller requests the bus
right from the bus arbiter. When the refresh cycle is completed, the refresh controller releases the
bus. For details see section 7, Refresh Controller.
External Bus Master: When the BRLE bit is set to 1 in BRCR, the bus can be released to an
external bus master. The external bus master has highest priority, and requests the bus right from
the bus arbiter by driving the BREQ signal low. Once the external bus master gets the bus, it keeps
the bus right until the BREQ signal goes high. While the bus is released to an external bus master,
the H8/3052BF holds the address bus and data bus control signals (AS, RD, HWR, and LWR) in
: n = 7 to 0), and holds the BACK
the high-impedance state, holds the chip select signals high (CS
n
pin in the low output state.
The bus arbiter samples the BREQ pin at the rise of the system clock ( ). If BREQ is low, the bus
is released to the external bus master at the appropriate opportunity. The BREQ signal should be
held low until the BACK signal goes low.
When the BREQ pin is high in two consecutive samples, the BACK signal is driven high to end
the bus-release cycle.
Rev. 3.00 Mar 21, 2006 page 140 of 814
REJ09B0302-0300
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