HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 159
HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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6.1
The chip has an on-chip bus controller (BSC) that manages the external address space divided into
eight areas. The bus specifications, such as bus width and number of access states, can be set
independently for each area, enabling multiple memories to be connected easily.
The bus controller also has a bus arbitration function, and controls the operation of the internal bus
masters—the CPU, DMA controller (DMAC), and data transfer controller (DTC).
6.1.1
The features of the bus controller are listed below.
• Manages external address space in area units
• Basic bus interface
• DRAM interface
• Burst ROM interface
⎯ In advanced mode, manages the external space as 8 areas of 2 Mbytes
⎯ Bus specifications can be set independently for each area
⎯ DRAM and burst ROM interfaces can be set
⎯ Chip select signals (CS
⎯ 8-bit access or 16-bit access can be selected for each area
⎯ 2-state access or 3-state access can be selected for each area
⎯ Program wait states can be inserted for each area
⎯ DRAM interface can be set for areas 2 to 5 (in advanced mode)
⎯ Row address/column address multiplexed output (8/9/10 bits)
⎯ 2-CAS access method
⎯ Burst operation (fast page mode)
⎯ TP cycle insertion to secure RAS precharging time
⎯ Selection of CAS-before-RAS refreshing or self-refreshing
⎯ Burst ROM interface can be set for area 0
⎯ Selection of 1- or 2-state burst access
Overview
Features
Section 6 Bus Controller
0
to CS
7
) can be output for areas 0 to 7
Rev.4.00 Sep. 07, 2007 Page 129 of 1210
REJ09B0245-0400
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