W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 61

• Manufacturer Part Number: W78E052DDG
• Description: IC MCU 8-BIT 8K FLASH 40-DIP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78E052DDG

• 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: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

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 in-
volves 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
0
1
1
0
1
0
1
SM1
Mode
0
1
2
3
Type
Synch.
Asynch.
Asynch.
Asynch.
Figure 16- 4 Serial port mode 3
Table 17- 1 Serial Ports Modes
W78E054D/W78E052D/W78E051D Data Sheet
Baud Clock
4 or 12 TCLKS
Timer 1 or 2
32 or 64
TCLKS
Timer 1 or 2
- 61 -
Frame
Size
8 bits
10 bits
11 bits
11 bits
Publication Release Date: Dec 29, 2009
Start
Bit
No
1
1
1
Stop
Bit
No
1
1
1
Revision A09
9th bit
Function
None
None
0, 1
0, 1