Z51F3220FNX Datasheet, PDF (256/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
USI1CR2 (USI1 Control Register 2: For UART, SPI, and I2C mode) : EAH
7
6
5
4
3
2
DRIE1
TXCIE1
RXCIE1
WAKEIE1
TXE1
RXE1
R/W
R/W
R/W
R/W
R/W
R/W
1
0
USI1EN
DBLS1
R/W
R/W
Initial value : 00H
DRIE1
TXCIE1
RXCIE1
WAKEIE1
TXE1
RXE1
USI1EN
DBLS1
Interrupt enable bit for data register empty (only UART and SPI mode).
0
Interrupt from DRE1 is inhibited (use polling)
1
When DRE1 is set, request an interrupt
Interrupt enable bit for transmit complete (only UART and SPI mode).
0
Interrupt from TXC1 is inhibited (use polling)
1
When TXC1 is set, request an interrupt
Interrupt enable bit for receive complete (only UART and SPI mode).
0
Interrupt from RXC1 is inhibited (use polling)
1
When RXC1 is set, request an interrupt
Interrupt enable bit for asynchronous wake in STOP mode. When device
is in stop mode, if RXD1 goes to low level an interrupt can be requested
to wake-up system. (only UART mode). At that time the DRIE1 bit and
USI1ST1 register value should be set to ‘0b’ and “00H”, respectively.
0
Interrupt from Wake is inhibited
1
When WAKE1 is set, request an interrupt
Enables the transmitter unit (only UART and SPI mode).
0
Transmitter is disabled
1
Transmitter is enabled
Enables the receiver unit (only UART and SPI mode).
0
Receiver is disabled
1
Receiver is enabled
Activate USI1 function block by supplying.
0
USI1 is disabled
1
USI1 is enabled
This bit selects receiver sampling rate (only UART)
0
Normal asynchronous operation
1
Double Speed asynchronous operation
PS029902-0212
PRELIMINARY
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