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參數(shù)資料
| 型號： | HI-7159A |
| 廠商： | Intersil Corporation |
| 英文描述： | 128 MACROCELL 3.3 VOLT ISP CPLD - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 微處理器兼容，5-1/2位A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大小： | 210K |
| 代理商： | HI-7159A |
7
Serial Mode 1
Serial Mode 1 is selected by tying SMS0 (Pin 18) low, SMS1
(Pin 19) high, and SEL (Pin 28) low (Figure 4B). In this mode
the HI-7159A interface emulates a UART, reading and
writing data in serial data packets of 1 start bit, 8 data bits,
1 parity bit (EVEN), and 1 stop bit. The baud rate is
determined by the state of BRS0 and BRS1 (Pins 24 and 25)
as shown in Table 2. Pin 15 becomes the serial receiver pin
(RXD) and pin 16 the serial transmitter pin (TXD). CS (Pin
17) remains a chip select and must either be tied to D
GND
or
pulled low (see Figure 2B) to access the device.
SAD0-SAD3 (Pins 20-23) are unused in this mode and
should be tied high.
Design Hints for Operating in the Parallel
Mode
1. Always read the status byte twice to make sure that it is
cleared.
2. Make sure the status byte is cleared before issuing a
command to change modes.
3. Read each digit pair five times before reading the next
byte to ensure that the output data is correct.
4. Use a watchdog timer to monitor conversion time. If
conversion time is either too long or too short, reissue the
conversion command.
TABLE 2. BAUD RATE SELECTION FOR MODES 1 AND 2
BRS0
PIN 24
BRS1
PIN 25
BAUD RATE
(f
XTAL
= 2.4576MHz)
BAUD RATE vs
f
XTAL
D
GND
D
GND
300
f
XTAL
/8192
D
GND
V
CC
1200
f
XTAL
/2048
V
CC
D
GND
9600
f
XTAL
/256
V
CC
V
CC
19200
f
XTAL
/128
+5V
CS
15
RD
14
28
SEL
1
27
16
17
ADDRESS
DECODER
26
25
D7
18
D0
RD
D7
D0
μ
P
X
TAL
DGND
ADDRESS
BUS
DATA
BUS
V
EE
V
CC
WR
WR
-5V
HI- 7159A
FIGURE 3. PARALLEL MODE CONFIGURATION
FIGURE 4A. SERIAL MODE 0
FIGURE 4B. SERIAL MODE 1
FIGURE 4C. SERIAL MODE 2
FIGURE 4. SERIAL MODE CONFIGURATIONS
+5V
CS
15
14
1
27
16
26
18
19
17
28
CLK
RXD/TXD
CLK
RXD/TXD
SM0
SM1
SEL
8051
μ
P
10
11
V
EE
V
CC
DGND
HI-7159A
-5V
20-25
+5V
X
TAL
X
TAL
+5V
TXD
RXD
RXD
TXD
SM0
+5V
SM1
BRS0
BRS1
+5V
20K
20K
X
TAL
X
TAL
V
CC
V
EE
CS
SEL
DGND
-5V
+5V
UART/
μ
P
15
16
14
1
27
19
17
18
24
25
26
28
20 - 23
HI-7159A
+5V
15
14
1
27
16
26
19
18
28
TXD
RXD
RXD
TXD
24
25
BRS0
BRS1
+5V
SM0
+5V
SEL
UART/
μ
P
20K
20K
SM1
ADDRESS
SELECT
20
21
22
23
17
V
CC
V
EE
D
GND
HI-7159A
-5V
TO UP TO 31 ADDITIONAL
HI-7159As
X
TAL
X
TAL
HI-7159A
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