em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 77

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
6.3.35 Bank0 R32: URCR1 (UART Control Register 1)
Bit 7 (URTD8): UART transmit data buffer 8
Bits 6~5 (UMODE1~UMODE0): UART mode select bits
Bits 4~2 (BRAT2~BRAT0): Transmit baud rate selection
Bit 1 (UTBE): UART transfer buffer empty flag. Set to “1” when transfer buffer is
Bit 0 (TXE):
6.3.36 Bank0 R33: URCR2 (UART Control Register 2)
Bits 7~6:
URTD8
Bit 7
Bit 7
0
UMODE1 UMODE0
Bit 6
Bit 6
0
empty. Reset to “0” automatically when write into URTD register.
Enable transmission
0: Disable transmission
1: Enable transmission
Not used, fixed to “0” all the time.
BRATE2
UTBE bit is cleared by hardware when transmission is enabled, and
UTBE bit is read-only. Therefore, Write URTD register is necessary
when you want to start shift transmitting.
UMODE1
0
0
0
0
1
1
1
1
SBIM1
Bit 5
Bit 5
0
0
1
1
BRATE1
BRATE2
EM78F648/644/642/641/548/544/542/541N
0
0
1
1
0
0
1
1
SBIM0
Bit 4
Bit 4
UMODE0
BRATE0
BRATE1
th
UINVEN
0
1
0
1
Bit 3
Bit 3
bit
0
1
0
1
0
1
0
1
NOTE
BRATE0
Baud Rate
Bit 2
Bit 2
Fc/104
Fc/208
Fc/416
Fc/13
Fc/26
Fc/52
TC3
0
UART Mode
Mode1: 7-bit
Mode1: 8-bit
Mode1: 9-bit
Reserved
8-Bit Microcontroller
Reserved
UTBE
Bit 1
Bit 1
0
38400
19200
8MHz
9600
4800
2400
1200
Bit 0
Bit 0
TXE
0
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