參數(shù)資料
型號(hào)： IS89C52
廠商： Integrated Silicon Solution, Inc.
英文描述： CMOS Single Chip 8-Bit Microcontroller with 8-Kbytes of Flash(帶8K字節(jié)閃速存儲(chǔ)器的CMOS單片8位微控制器)
中文描述： CMOS單芯片8位微控制器與8的快閃記憶體（帶8K的字節(jié)閃速存儲(chǔ)器的的CMOS單片8位微控制器）
文件頁(yè)數(shù)： 20/50頁(yè)
文件大小： 425K
代理商： IS89C52
IS89C52
20
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98
ISSI
SERIAL INTERFACE
The Serial port is full duplex, which means it can transmit
and receive simultaneously. It is also receive-buffered,
which means it can begin receiving a second byte before
a previously received byte has been read from the receive
register. (However, if the first byte still has not been read
when reception of the second byte is complete, one of the
bytes will be lost.) The serial port receive and transmit
registers are both accessed at Special Function Register
SBUF. Writing to SBUF loads the transmit register, and
reading SBUF accesses a physically separate receive
register.
The serial port can operate in the following four modes:
Mode 0:
Serial data enters and exits through RXD. TXD outputs the
shift clock. Eight data bits are transmitted/received, with
the LSB first. The baud rate is fixed at 1/12 the oscillator
frequency (see Figure 15).
Mode 1:
Ten bits are transmitted (through TXD) or received (through
RXD): a start bit (0), eight data bits (LSB first), and a stop
bit (1). On receive, the stop bit goes into RB8 in Special
Function Register SCON. The baud rate is variable (see
Figure 16).
Mode 2:
Eleven bits are transmitted (through TXD) or received
(through RXD): a start bit (0), eight data bits (LSB first), a
programmable ninth data bit, and a stop bit (1). On transmit,
the ninth data bit (TB8 in SCON) can be assigned the value
of 0 or 1. Or, for example, the parity bit (P, in the PSW) can
be moved into TB8. On receive, the ninth data bit goes into
RB8 in Special Function Register SCON, while the stop bit
is ignored. The baud rate is programmable to either 1/32 or
1/64 the oscillator frequency (see Figure 17).
Mode 3:
Eleven bits are transmitted (through TXD) or received
(through RXD): a start bit (0), eight data bits (LSB first), a
programmable ninth data bit, and a stop bit (1). In fact,
Mode 3 is the same as Mode 2 in all respects except the
baud rate, which is variable in Mode 3 (see Figure 18).
In all four modes, transmission is initiated by any instruction
that uses SBUF as a destination register. Reception is
initiated in Mode 0 by the condition RI = 0 and REN = 1.
Reception is initiated in the other modes by the incoming
start bit if REN = 1.
Timer/Counter 2 Set-Up
Except for the baud rate generator mode, the values given
for T2C0N do not include the setting of the TR2 bit. Therefore,
bit TR2 must be set separately to turn the Timer on.
Table 7. Timer/Counter 2 Used as a Timer
T2CON
Mode
Internal
Control
(1)
External
Control
(2)
16-Bit Auto-Reload
00H
08H
16-Bit Capture
01H
09H
Baud Rate Generator Receive
and Transmit Same Baud Rate
34H
36H
Receive Only
24H
26H
Transmit Only
14H
16H
Table 8. Timer/Counter 2 Used as a Counter
TMOD
Mode
Internal
Control
(1)
External
Control
(2)
16-Bit Auto-Reload
02H
0AH
16-Bit Capture
03H
0BH
Notes:
1. Capture/Reload occurs only on Timer/Counter overflow.
2. Capture/Reload occurs on Timer/Counter overflow and
a 1-to-0 transition on T2EX (P1.1) pin except when
Timer 2 is used in the baud rate generating mode.
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IS89C52-12PL 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-12PLI 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-12PQ 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-12PQI 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-12W 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
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