參數(shù)資料
型號(hào)： P80C557E6
廠商： NXP Semiconductors N.V.
英文描述： Single-chip 8-bit microcontroller(單片8位微控制器)
中文描述： 單芯片8位微控制器（單片8位微控制器）
文件頁(yè)數(shù)： 31/64頁(yè)
文件大?。?/td> 476K
代理商： P80C557E6
Philips Semiconductors
Product specification
P83C557E6/P80C557E6
Single-chip 8-bit microcontroller
1999 Mar 02
31
The Control Register, S1CON
The CPU can read from and write to this 8-bit, directly addressable
SFR. Two bits are affected by the SIO1 hardware: the SI bit is set
when a serial interrupt is requested, and the STO bit is cleared when
a STOP condition is present on the I
2
C bus. The STO bit is also
cleared when ENS1 = 0.
Figure 30. Serial control (S1CON) register.
7
6
5
4
3
2
1
0
S1CON (D8H)
CR2
ENS1
STA
STO
SI
AA
CR1
CR0
Table 24.
SYMBOL
Description of S1CON bits
BIT
FUNCTION
CR2
S1CON.7
Clock rate bit 2, see Table 25.
ENS1
S1CON.6
ENS1 = 0:
ENS1 = 1:
Serial I/O
Serial I/O
disabled and reset. SDA and SCL outputs are high–Z.
enabled.
STA
S1CON.5
START flag. When this bit is set in slave mode, the hardware checks the I
2
C bus and generates a START
condition if the bus is free or after the bus becomes free. If the device operates in master mode it will
generate a repeated START condition.
STO
S1CON.4
STOP flag. If this bit is set in a master mode a STOP condition is generated. A STOP condition detected on
the I
2
C bus clears this bit. This bit may also be set in slave mode in order to recover from an error
condition. In this case no STOP condition is generated to the I
2
C bus, but the hardware releases the SDA
and SCL lines and switches to the not selected receiver mode. The STOP flag is cleared by the hardware.
SI
S1CON.3
Serial Interrupt flag. This flag is set, and an interrupt request is generated, after any of the following events
occur:
– A START condition is generated in master mode.
– The own slave address has been received during AA = 1.
– The general call address has been received while S1ADR.0 and AA = 1.
– A data byte has been received or transmitted in master mode (even if arbitration is lost).
– A data byte has been received or transmitted as selected slave.
– A STOP or START condition is received as selected slave receiver or transmitter.
While the SI flag is set, SCL remains LOW and the serial transfer is su– spended. SI must be reset by software.
Assert Acknowledge flag. When this bit is set, an acknowledge is returned after any one of the following
conditions:
– Own slave address is received.
– General call address is received (S1ADR.0 = 1).
– A data byte is received, while the device is programmed to be a master receiver.
– A data byte is received. while the device is a selected slave receiver.
When the bit is reset, no acknowledge is returned. Consequently, no interrupt is requested when the own
address or general call address is received.
AA
S1CON.2
CR1
CR0
S1CON.1
S1CON.0
Clock rate bits 1 and 0, see Table 25.
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