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型號(hào)：	HD6473048
廠商：	Hitachi,Ltd.
英文描述：	Hitachi Single-Chip Microcomputer
中文描述：	日立單片機(jī)
文件頁(yè)數(shù)：	156/867頁(yè)
文件大?。?/td>	2771K
代理商：	HD6473048

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

signal low. Once the external bus master gets the bus, it

keeps the bus right until the

signal goes high. While the bus is released to an external bus

master, the H8/3048 Series holds the address bus and data bus control signals (

) in the high-impedance state, holds the chip select signals high (

: n = 7 to 0), and

pin in the low output state.

The bus arbiter samples the

pin at the rise of the system clock (). If

is low, the bus

is released to the external bus master at the appropriate opportunity. The

signal should be

held low until the

signal goes low.

pin is high in two consecutive samples, the

signal is driven high to end

the bus-release cycle.

相關(guān)PDF資料	PDF描述
HD6433044	Hitachi Single-Chip Microcomputer
HD6433045	Multipole Connector; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No RoHS Compliant: No
HD6433047	CONN HEADER .100 SNGL STR 36POS
HD6433048	Hitachi Single-Chip Microcomputer
HD64F3642A	H8/3644 Series Hardware Manual

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HD6473048F16	制造商:Renesas Electronics Corporation 功能描述:H8/300H, 16MHZ QFP PACKAGE - Trays
HD6473048F18	制造商:Renesas Electronics Corporation 功能描述:
HD6473048SF16	制造商:Renesas Electronics Corporation 功能描述:
HD6473048SF18	制造商:Renesas Electronics Corporation 功能描述:
HD6473214F16	制造商:Renesas Electronics Corporation 功能描述:

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