CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U15195EJ5V0UD
444
(2) Asynchronous serial interface mode register 11 (ASIM11)
The ASIM11 register is an 8-bit register that controls the UART1 transfer mode.
This register can be read/written in 8-bit or 1-bit units
7
0
ASIM11
6
0
5
0
4
0
3
MOD
2
UMST
1
UMSR
0
EBS
Address
FFFFFA2AH
After reset
00H
Bit position
Bit name
Function
3 MOD
Specifies operation mode (asynchronous/synchronous mode)
0: Asynchronous mode
1: Synchronous mode
2 UMST Specifies number of continuous frame transmissions.
0: 1-frame data transmission
1: 2-frame continuous data transmission
1 UMSR Specifies number of continuous frame receptions.
0: 1-frame data reception
1: 2-frame continuous data reception
0 EBS
Specifies extension bit operation for transmit/receive data when no parity is
specified (PS0 = PS1 = 0).
0: Disables extension bit addition
1: Enables extension bit addition
When the extension bit is specified, 1 data bit is added on top of the 8 bits of
transmit/receive data, enabling 9-bit data communication.
Extension bit specification is valid only when no parity (ASIM10 register’s PS0 bit =
PS1 bit = 0) and 1-frame data transmission (UMST = 0) are specified. When 0
parity, odd parity, or even parity are specified, or when 2-frame continuous data
transmission (UMST bit = 1) is specified, the EBS bit setting becomes invalid and
extension bit addition is not performed.
Extension bit addition (EBS bit = 1) and 2-frame continuous data reception (UMSR
bit = 1) cannot be set simultaneously.
Содержание PD703114
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