參數(shù)資料
型號: COP8SDR9LVA8
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 微控制器/微處理器
英文描述: 8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout
中文描述: 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQCC68
封裝: PLASTIC, LCC-68
文件頁數(shù): 45/80頁
文件大?。?/td> 972K
代理商: COP8SDR9LVA8
14.0 USART
(Continued)
14.1 USART CONTROL AND STATUS REGISTERS
The operation of the USART is programmed through three
registers: ENU, ENUR and ENUI.
14.2 DESCRIPTION OF USART REGISTER BITS
ENU—USART CONTROL AND STATUS REGISTER
(Ad-
dress at 0BA)
PEN
PSEL1
XBIT9/
CHL1
CHL0
ERR
RBFL
TBMT
PSEL0
Bit 7
Bit 0
PEN:
This bit enables/disables Parity (7- and 8-bit modes
only). Read/Write, cleared on reset.
PEN = 0
PEN = 1
PSEL1, PSEL0:
Parity select bits. Read/Write, cleared on
reset.
PSEL1 = 0, PSEL0 = 0
Odd Parity (if Parity enabled)
PSEL1 = 0, PSEL1 = 1
Even Parity (if Parity enabled)
PSEL1 = 1, PSEL0 = 0
Mark(1) (if Parity enabled)
PSEL1 = 1, PSEL1 = 1
Space(0) (if Parity enabled)
XBIT9/PSEL0:
Programs the ninth bit for transmission when
the USART is operating with nine data bits per frame. For
seven or eight data bits per frame, this bit in conjunction with
PSEL1 selects parity. Read/Write, cleared on reset.
CHL1, CHL0:
These bits select the character frame format.
Parity is not included and is generated/verified by hardware.
Parity disabled.
Parity enabled.
10138925
FIGURE 22. USART Block Diagram
C
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