gc80c520a CORERIVER Semiconductor, gc80c520a Datasheet - Page 46

• Manufacturer Part Number: gc80c520a
• Description: Midas1.0 Family Mask Rom/eprom/romless 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

6.2.5 UART (Universal Asynchronous Rx/Tx)
UART in the MiDAS1.0 family is a full duplex port. It includes additional features such as the Automatic
Address Recognition. The UART port provides both synchronous and asynchronous communication
modes. In the synchronous mode, the MiDAS1.0 family generates the communication clock and operates
in a half duplex mode. In the asynchronous mode, the UART port operates as a full duplex port. This
means that it can transmit and receive data simultaneously. The transmit buffer and the receive buffer are
both addressed as SBUF SFR. However, writing to SBUF loads the transmit buffer, and reading SBUF
accesses a physically separate receive buffer. The UART port can operate in four different modes as
described below.
6.2.5.1 Mode 0
This mode provides synchronous communication with external devices. Serial data enters and exits
Max: 750 KHz
Max: 3 MHz
T1M=0
62.5 KHz
19.2 KHz
137.5 Hz
9.6 KHz
4.8 KHz
2.4 KHz
1.2 KHz
110 Hz
110 Hz
Baudrate
Max: 3 MHz
T1M=1
187.5 KHz
Max : 750
57.6 KHz
28.8 KHz
14.4 KHz
412.5 Hz
7.2 KHz
3.6 KHz
330 Hz
330 Hz
KHz
Mode 0
Mode 2
Mode 1
UART
Mode
& 3
Table 6-7 Baudrate Example
Page 46 of 187
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
FOSC
12 MHz
12 MHz
12 MHz
12 MHz
6 MHz
SMOD1
X
1
1
1
0
0
0
0
0
0
0
Functional Description
C/T
X
X
0
0
0
0
0
0
0
0
0
Timer 1
Mode
X
X
2
2
2
2
2
2
2
2
1
Reload
(TH1)
Value
FEEBh
FDh
FDh
1Dh
FAh
E8h
72h
FFh
F4h
X
X