HD6412350 Hitachi, HD6412350 Datasheet - Page 143
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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Table 6-1
Name
Upper column address strobe
Lower column strobe
Wait
Bus request
Bus request acknowledge
Bus request output
6.1.4
Table 6-2 summarizes the registers of the bus controller.
Table 6-2
Name
Bus width control register
Access state control register
Wait control register H
Wait control register L
Bus control register H
Bus control register L
Memory control register
DRAM control register
Refresh timer/counter
Refresh time constant register
Notes: 1. Lower 16 bits of the address.
2. Determined by the MCU operating mode.
Register Configuration
Bus Controller Pins (cont)
Bus Controller Registers
Abbreviation
ABWCR
ASTCR
WCRH
WCRL
BCRH
BCRL
MCR
DRAMCR
RTCNT
RTCOR
Symbol I/O
CAS
LCAS
WAIT
BREQ
BACK
BREQO Output
Output
Output
Input
Input
Output
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
2-CAS DRAM upper column address strobe
signal.
DRAM lower column address strobe signal.
Wait request signal when accessing
external 3-state access space.
Request signal that releases bus to
external device.
Acknowledge signal indicating that bus has
been released.
External bus request signal used when
internal bus master accesses external
space when external bus is released.
Power-On
Reset
H'FF/H'00*
H'FF
H'FF
H'FF
H'D0
H'3C
H'00
H'00
H'00
H'FF
Initial Value
2
Manual
Reset
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Address*
H'FED0
H'FED1
H'FED2
H'FED3
H'FED4
H'FED5
H'FED6
H'FED7
H'FED8
H'FED9
1
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