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| 型号： | ST72P63BE4M1 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-24 |
| 文件页数： | 139/145页 |
| 文件大小： | 2984K |
| 代理商： | ST72P63BE4M1 |
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ST7263BDx ST7263BHx ST7263BKx ST7263BE
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IC bus interface (Cont’d)
12.5.7 Register description
IC Control Register (CR)
Read / Write
Reset value: 0000 0000 (00h)
Bits 7:6 = Reserved. Forced to 0 by hardware.
Bit 5 = PE Peripheral enable.
This bit is set and cleared by software.
0: Peripheral disabled
1: Master/Slave capability
Notes:
– When PE=0, all the bits of the CR register and
the SR register except the Stop bit are reset. All
outputs are released while PE=0
– When PE=1, the corresponding I/O pins are se-
lected by hardware as alternate functions.
– To enable the IC interface, write the CR register
TWICE with PE=1 as the first write only activates
the interface (only PE is set).
Bit 4 = ENGC Enable General Call.
This bit is set and cleared by software. It is also
cleared by hardware when the interface is disa-
bled (PE=0). The 00h General Call address is ac-
knowledged (01h ignored).
0: General Call disabled
1: General Call enabled
Note: In accordance with the I2C standard, when
GCAL addressing is enabled, an I2C slave can
only receive data. It will not transmit data to the
master.
Bit 3 = START Generation of a Start condition.
This bit is set and cleared by software. It is also
cleared by hardware when the interface is disa-
bled (PE=0) or when the Start condition is sent
(with interrupt generation if ITE=1).
– In master mode:
0: No start generation
1: Repeated start generation
– In slave mode:
0: No start generation
1: Start generation when the bus is free
Bit 2 = ACK Acknowledge enable.
This bit is set and cleared by software. It is also
cleared by hardware when the interface is disa-
bled (PE=0).
0: No acknowledge returned
1: Acknowledge returned after an address byte or
a data byte is received
Bit 1 = STOP Generation of a Stop condition.
This bit is set and cleared by software. It is also
cleared by hardware in master mode. Note: This
bit is not cleared when the interface is disabled
(PE=0).
– In Master mode:
0: No stop generation
1: Stop generation after the current byte transfer
or after the current Start condition is sent. The
STOP bit is cleared by hardware when the Stop
condition is sent.
– In Slave mode:
0: No stop generation
1: Release the SCL and SDA lines after the cur-
rent byte transfer (BTF=1). In this mode the
STOP bit has to be cleared by software.
Bit 0 = ITE Interrupt enable.
This bit is set and cleared by software and cleared
by hardware when the interface is disabled
(PE=0).
0: Interrupts disabled
1: Interrupts enabled
Refer to Figure 46 for the relationship between the
events and the interrupt.
SCL is held low when the SB, BTF or ADSL flags
or an EV6 event (See Figure 45) is detected.
70
0
PE
ENGC START
ACK
STOP
ITE
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