W78E058DFG Nuvoton Technology Corporation of America, W78E058DFG Datasheet - Page 63

• Manufacturer Part Number: W78E058DFG
• Description: IC MCU 8-BIT 32K FLASH 44-PQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78E058DFG

• Core Processor: 8052
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 36
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

done.
1. RI must be 0 and
2. Either SM2 = 0, or the received stop bit = 1.
If these conditions are met, then the stop bit goes to RB8, the 8 data bits go into SBUF and RI is set.
Otherwise the received frame may be lost. After the middle of the stop bit, the receiver goes back to
looking for a 1-to-0 transition on the RxD pin.
MODE 3
This mode is similar to Mode 2 in all respects, except that the baud rate is programmable. The user
must first initialize the Serial related SFR SCON before any communication can take place. This
involves selection of the Mode and baud rate. The Timer 1 should also be initialized if modes 1 and 3
are used. In all four modes, transmission is started by any instruction that uses SBUF as a destination
register. Reception is initiated in Mode 0 by the condition RI = 0 and REN = 1. This will generate a
clock on the TxD pin and shift in 8 bits on the RxD pin. Reception is initiated in the other modes by the
incoming start bit if REN = 1. The external device will start the communication by transmitting the start
bit.
SM0
0
SMOD
Overflow
Timer 1
TCLK
RCLK
1/2
0
SM1
0
0
0
1
SAMPLE
RXD
Overflow
Timer 2
1
1
Mode
0
DETECTOR
1-To-0
1/16
1/16
Preliminary W78E516D/ W78E058D Data Sheet
Type
Synch.
Figure 15- 4 Serial port mode 3
TX START
TX CLOCK
RX CLOCK
TX START
Write to
SBUF
DETECTOR
BIT
Baud Clock
4 or 12 TCLKS
Controllor
Serial
LOAD SBUF
- 63 -
Data Bus
Internal
TX SHIFT
RX SHIFT
TB8
TI
RI
1
0
Receive Shift Register
Frame
Size
8 bits
CLOCK
SIN
Transmit Shift Register
D8
STOP
START
PARIN
LOAD
CLOCK
Publication Release Date: July 30, 2008
PAROUT
D8
SOUT
Start
Bit
No
Serial Interrupt
SBUF
RB8
TXD
Stop
Bit
No
Read SBUF
Revision A01
9th bit
Function
None
Data Bus
Internal