UPD77111 NEC, UPD77111 Datasheet - Page 14

• Manufacturer Part Number: UPD77111
• Description: 16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSORS
• Manufacturer: NEC

• Interrupt
• External data memory interface
14
INT1 - INT3
INT4
X/Y
DA0 - DA14
D0 - D15
MRD
MWR
HOLDRQ
BSTB
HOLDAK
Pin Name
Pin Name
Remark Pins marked “3S” under the heading “I/O” go into a high-impedance state in the following conditions:
X/Y, DA0-DA14, MRD, MWR: When the bus is released (HOLDAK = low level)
D0-D15:
(HOLDAK = low level)
91 - 89
88
99
16 - 2
34 - 27,
24 - 17
97
96
92
94
93
100-pin
TQFP
100-pin
TQFP
When the external data memory is not being accessed and when the bus is released
77 - 75
74
Pin No.
80-pin
TQFP
Pin No.
80-pin
TQFP
D4, A3,
B4
A4
80-pin
FBGA
80-pin
FBGA
Data Sheet U12801EJ4V0DS00
Output
Output
Output
Output
Output
Output
Input
Input
Input
(3S)
(3S)
(3S)
(3S)
(3S)
I/O
I/O
I/O
External maskable interrupt input.
•
Memory select signal output.
Address bus of external data memory.
•
•
•
16-bit data bus.
•
Read output
•
Write output
•
Hold request signal
•
Bus strobe signal
•
Hold acknowledge signal
•
Detected at the falling edge.
0: Uses X memory.
1: Uses Y memory.
Accesses the external memory.
Continuously outputs the external memory
address accessed last when the external
memory is not being accessed. Kept low
(0x000) if the external memory is never
accessed after reset.
DA14 is NC (no connection) and does not
function on the PD77112.
Accesses the external memory.
External memory read
External memory write
Input a low level to this pin when the external
device uses the external data memory bus of
the PD77110 and 77112.
77112 use the external data memory bus.
This pin goes low when the external device
is enabled to use the external data memory
bus of the PD77110 and 77112.
This pin goes low when the PD77110 and
Function
Function
PD77110, 77111, 77112
WAKEUP
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