HD64F3048BF25 Renesas Electronics America, HD64F3048BF25 Datasheet - Page 182
HD64F3048BF25
Manufacturer Part Number
HD64F3048BF25
Description
IC H8 MCU FLASH 128K 100QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Datasheet
1.DF3048BF25V.pdf
(903 pages)
Specifications of HD64F3048BF25
Core Processor
H8/300H
Core Size
16-Bit
Speed
8MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
70
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
4K 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-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
HD64F3048BF25
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
Part Number:
HD64F3048BF25V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
- Current page: 182 of 903
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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, DMAC
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 H8/3048B Group
holds the address bus and data bus control signals (AS, RD, HWR, and LWR) in the high-
: n = 7 to 0), and holds the BACK pin in
impedance state, holds the chip select signals high (CS
n
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 Sep 27, 2006 page 154 of 872
REJ09B0325-0300
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