HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 26

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Table 1-3 Pin Functions (cont)
Type
System control RES
Interrupts
Address bus
Data bus
Bus control
Symbol
RESO
(RESO/V
STBY
BREQ
BACK
NMI
IRQ
IRQ
A
D
CS
AS
RD
HWR
LWR
WAIT
23
15
7
5
0
to A
to D
to CS
to
0
0
PP
0
)
69
Pin No.
63
10
62
59
60
64
17, 16,
90 to 87
97 to 100,
56 to 45,
43 to 36
34 to 23,
21 to 18
8, 97 to 99, Output Chip select: Select signals for areas 7 to 0
88 to 91
70
71
72
58
I/O
Input
Output Reset output: Outputs a reset signal to
Input
Input
Output Bus request acknowledge: Indicates that the
Input
Input
Output Address bus: Outputs address signals
Input/
output
Output Address strobe: Goes low to indicate valid
Output Read: Goes low to indicate reading from the
Output High write: Goes low to indicate writing to the
Output Low write: Goes low to indicate writing to the
Input
11
Name and Function
Reset input: When driven low, this pin resets
the chip
external devices
Also used as a power supply for on-board
programming of the flash memory version.
Standby: When driven low, this pin forces
a transition to hardware standby mode
Bus request: Used by an external bus master
to request the bus right
bus has been granted to an external bus
master
Nonmaskable interrupt: Requests a
nonmaskable interrupt
Interrupt request 5 to 0: Maskable interrupt
request pins
Data bus: Bidirectional data bus
address output on the address bus
external address space
external address space; indicates valid data on
the upper data bus (D
external address space; indicates valid data on
the lower data bus (D
Wait: Requests insertion of wait states in bus
cycles during access to the external address
space
7
15
to D
to D
0
).
8
).