MT9079 Mitel Semiconductor, MT9079 Datasheet - Page 38

• Manufacturer Part Number: MT9079
• Description: CMOS ST-BUS FAMILY Advanced Controller for E1
• Manufacturer: Mitel Semiconductor

MT9079
Applications
Microprocessor Interfaces
Figure 7 illustrates a circuit which connects the
MT9079 to a MC68HC11 microcontroller operating at
2.1 MHz. Address lines A
latched with the AS signal to generate one of eight
possible Chip Selects (CS). A
select the individual control and status registers of
the MT9079, and AD
transfer only.
4-274
Figure 7 - MT9079 to MC68HC11 (2.1 MHz) Microcontroller Interface Circuit
(CPHA = 1)
(CPOL = 0)
MC68HC11
80C52
AD0-AD7
0
A
A
Figure 8 - MT9079 to 80C52 Microcontroller Interface Circuit
A
A
13
XTAL2
D
- AD
MISO
MOSI
13
8
8
13
SCK
INT0
0
R/W
INT1
-A
-A
IRQ
P1.0
P1.1
-A
ALE
-A
-D
WR
AS
SS
RD
15
12
- A
E
15
12
7
7
8
15
are used for data
- A
+5V
are decoded and
12
10k
D
3
CLR
PR
74HCT04
74HCT08
are used to
74HCT04
Q
74HCT74
3
5
8
74HCT04
74HCT04
74HCT04
D
PR
74HCT04
Q
5
8
74HCT74
The receive and transmit data link signals can be
connected directly to the MC68HC11 serial port,
when it is operating is slave mode. With this circuit, it
is important to make the CPHA bit high in the
MC68HC11 Serial Peripheral Control Register so the
SS input can be tied low.
Figure 8 shows a circuit which interfaces the
MT9079 to the 80C52 microcontroller. The 80C52
RD and WR signals are used to generate a R/W
signal for the MT9079. RD and WR are also re-timed
using the XTAL2 output to produce a Data Strobe
(DS) signal that will meet t
interface is similar to the MC68HC11 interface.
D
+5V
PR
+5V
Q
10k
4.7k
CS
IRQ
A
D
R/W
DS
S/P
TxDL
RxDL
DLCLK
R/W
CS
DS
S/P
A
D
DLCLK
RxDL
TxDL
IRQ
0
0
0
0
-A
-D
-A
MT9079
-D
MT9079
4
7
4
7
RWS
. The remainder of this