UPD77016 NEC, UPD77016 Datasheet - Page 12

• Manufacturer Part Number: UPD77016
• Description: 16 bits/ Fixed-point Digital Signal Processor
• Manufacturer: NEC

Remark
12
P3 - P0
HA1
HA0
HCS
HRD
HWR
HRE
HWE
HD7 - HD0
• I/O port
• Host interface
Symbol
Symbol
The state of the pins added 3S becomes high impedance when the host does not access host interface.
9 - 12
83
82
79
80
81
92
93
84 - 91
Pin No.
Pin No.
I/O (3S)
I/O
I/O
I/O
O
O
I
I
I
I
I
I/O port
Specifies register which HD7 to HD0 access
Specifies bits of registers which HD7 to HD0 access
Chip select input
Host read input
Host write input
Host read enable output
Host write enable output
8 bits host data bus
1: Accesses HST:
0: Accesses HDT
0: Accesses HDT
• 1: Accesses bits 15-8 of HST, HDT (out), HDT (in)
• 0: Accesses bits 7-0 of HST, HDT (out), HDT (in)
(in)
(out)
: Host receive data register when
: Host transmit data register when
Host interface status register
when HA1 = 0
HRD = 0
HWR = 0
Function
Function
PD77016