HD6412350 Hitachi, HD6412350 Datasheet - Page 205
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
HD6412350F10
Manufacturer:
HITACHI/日立
Quantity:
20 000
Company:
Part Number:
HD6412350F20
Manufacturer:
RENESAS
Quantity:
648
Company:
Part Number:
HD6412350F20
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Part Number:
HD6412350F20
Manufacturer:
HITACHI/日立
Quantity:
20 000
Company:
Part Number:
HD6412350F20V
Manufacturer:
RENESAS
Quantity:
586
Company:
Part Number:
HD6412350F20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Part Number:
HD6412350F20V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
Part Number:
HD6412350TE20
Manufacturer:
HITACHI/日立
Quantity:
20 000
Company:
Part Number:
HD6412350TE20IV
Manufacturer:
DALLAS
Quantity:
2 874
- Current page: 205 of 989
- Download datasheet (4Mb)
6.10
6.10.1
The H8S/2350 Series can release the external bus in response to a bus request from an external
device. In the external bus released state, the internal bus master continues to operate as long as
there is no external access.
If an internal bus master wants to make an external access in the external bus released state, or if a
refresh request is generated, it can issue a bus request off-chip.
6.10.2
In external expansion mode, the bus can be released to an external device by setting the BRLE bit
in BCRL to 1. Driving the BREQ pin low issues an external bus request to the H8S/2350 Series.
When the BREQ pin is sampled, at the prescribed timing the BACK pin is driven low, and the
address bus, data bus, and bus control signals are placed in the high-impedance state, establishing
the external bus-released state.
In the external bus released state, an internal bus master can perform accesses using the internal
bus. When an internal bus master wants to make an external access, it temporarily defers
activation of the bus cycle, and waits for the bus request from the external bus master to be
dropped. Even if a refresh request is generated in the external bus released state, refresh control is
deferred until the external bus master drops the bus request.
If the BREQOE bit in BCRL is set to 1, when an internal bus master wants to make an external
access in the external bus released state, or when a refresh request is generated, the BREQO pin is
driven low and a request can be made off-chip to drop the bus request.
When the BREQ pin is driven high, the BACK pin is driven high at the prescribed timing and the
external bus released state is terminated.
If an external bus release request and external access occur simultaneously, the order of priority is
as follows:
If a refresh request and external bus release request occur simultaneously, the order of priority is
as follows:
As a refresh and an external access by an internal bus master can be executed simultaneously,
there is no relative order of priority for these two operations.
Bus Release
Overview
Operation
(High) External bus release > Internal bus master external access (Low)
(High) Refresh > External bus release (Low)
185
Related parts for HD6412350
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Silicon N-Channel Power MOS FET Module
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
High Speed Power Switching
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
Silicon N-Channel IGBT
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
IGBT MODULE RANGE WITH SOFT AND FAST (SFD) FREE-WHEELING DIODES
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
IGBT MODULE RANGE WITH SOFT AND FAST (SFD) FREE-WHEELING DIODES
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
IGBT MODULE RANGE WITH SOFT AND FAST (SFD) FREE-WHEELING DIODES
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
8MHz V(cc): -0.3 to +7.0V V(in): -0.3 to +0.3V advanced CRT controller (ACRTC)
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
65,536-WORD x 4-BIT MULTIPORT CMOS VIDEO RAM
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
65,536-WORD x 4-BIT MULTIPORT CMOS VIDEO RAM
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
65,536-word ? 4-bit High Speed CMOS Static RAM
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
SINGLE CHIP CODEC WITH FILTERS(COMBO)
Manufacturer:
HITACHI
Datasheet: