W77E058A40DL Nuvoton Technology Corporation of America, W77E058A40DL Datasheet - Page 67

• Manufacturer Part Number: W77E058A40DL
• Description: IC MCU 8-BIT 32K FLASH 40-DIP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W77r

Specifications of W77E058A40DL

• Program Memory Type: FLASH
• Program Memory Size: 32KB (32K x 8)
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, Serial Port
• Peripherals: POR, WDT
• Number Of I /o: 32
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP
• Cpu Family: W77
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Interface Type: UART
• Total Internal Ram Size: 1KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 40
• Package Type: PDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant

shifting in 9 data bits, there is one more shift to do, after which the SBUF and RB8 are loaded and RI
is set. However certain conditions must be met before the loading and setting of RI can be done.
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.
14.4 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.
(SMOD_1)
SMOD=
Overflow
1. RI must be 0 and
2. Either SM2 = 0, or the received stop bit = 1.
TCLK
RCLK
Timer 1
RXD
2
0
SAMPLE
0
0
1
(for Serial Port 0 only)
1
1
DETECTOR
Timer 2 Overflow
1-TO-0
16
16
Write to
SBUF
START
RX CLOCK
TX CLOCK
TX START
CONTROLLER
DETECTOR
RX
SERIAL
Figure 23. Serial Port Mode 3
BIT
Data Bus
RX SHIFT
TX SHIFT
Internal
LOAD
SBUF
- 67 -
TI
RI
TB8
Receive Shift Register
CLOCK
SIN
PAROUT
Transmit Shift Register
STOP
LOAD
CLOCK
START
PARIN
D8
D8
Publication Release Date: April 17, 2007
SOUT
SBUF
RB8
Serial Port
W77E058A
SBUF
Read
Interrupt
TXD
Revision A10
Internal
Data
Bus