Z86E61 Zilog., Z86E61 Datasheet - Page 11

• Manufacturer Part Number: Z86E61
• Description: CMOS Z8 16K/32K EPROM MICROCONTROLLER
• Manufacturer: Zilog.

Port 3 (P37-P30). Port 3 is an 8-bit, CMOS compatible four-
fixed input and four-fixed output port. These eight I/O lines
have four-fixed (P33-P30) input and four-fixed (P37-P34)
Port 3 is configured under software control to provide the
following control functions: handshake for Ports 0 and 2
(/DAV and RDY); four external interrupt request signals
Notes:
HS = Handshake Signals
D = Data Available
R = Ready
Pin
P30
P31
P32
P33
P34
P35
P36
P37
T0
T1
OUT
OUT
OUT
OUT
I/O
IN
IN
IN
IN
CTC1
T
T
OUT
IN
IRQ3
IRQ2
IRQ0
IRQ1
IRQ4
IRQ5
Int.
Z86E61
MCU
/E63
Table 5. Port 3 Pin Assignments
Figure 9. Port 3 Configuration
P R E L I M I N A R Y
P0 HS
D/R
R/D
P1 HS
output ports. Port 3, when used as serial I/O, is pro-
grammed as serial in and serial out, respectively
(Figure 9).
(IRQ3-IRQ0); timer input and output signals (T
Data Memory Select (/DM) and EPROM control signals
(P30 = /CE, P31 = /OE, P32 = EPM and P33 = V
D/R
R/D
Port 3
(I/O or Control)
P2 HS
D/R
R/D
Serial Out
Serial In
UART
Ext
DM
WITH
Z86E61/E63 Z8
16K/32K EPROM
IN
EPROM
and T
PP
EPM
/CE
/OE
V
).
PP
®
OUT
MCU
11
),