W77E058A40DL Nuvoton Technology Corporation of America, W77E058A40DL Datasheet - Page 58

• 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

12.3.3 Auto-Reload Mode, Counting Up/Down
Timer/Counter 2 will be in auto-reload mode as an up/down counter if CP RL
cleared and the DCEN bit in T2MOD is set. In this mode, Timer/Counter 2 is an up/down counter
whose direction is controlled by the T2EX pin. A 1 on this pin cause the counter to count up. An
overflow while counting up will cause the counter to be reloaded with the contents of the capture
registers. The next down count following the case where the contents of Timer/Counter equal the
capture registers will load an FFFFh into Timer/Counter 2. In either event a reload will set the TF2 bit.
A reload will also toggle the EXF2 bit. However, the EXF2 bit can not generate an interrupt while in this
mode.
12.3.4 Baud Rate0 Generator Mode
The baud rate generator mode is enabled by setting either the RCLK or TCLK bits in T2CON register.
While in the baud rate generator mode, Timer/Counter 2 is a 16 bit counter with auto reload when the
count rolls over from FFFFh. However, rolling over does not set the TF2 bit. If EXEN2 bit is set, then a
negative transition of the T2EX pin will set EXF2 bit in the T2CON register and cause an interrupt
request.
div. by 4
div. by 64
div. by 1024 osc/256
Mode
Clock Source
EXEN2 = T2CON.3
div. by 4
div. by 64
div. by 1024 osc/512
Mode
TR2 = T2CON.2
Clock Source
T2EX = P1.1
TR2 = T2CON.2
T2EX = P1.1
T2 = P1.0
T2 = P1.0
osc/1
osc/16
input
osc/2
osc/32
input
1/12
1/4
T2M = CKCON.5
0
1
Figure 16. 16-Bit Auto-reload Up/Down Counter
C/T = T2CON.1
Figure 17. Baud Rate Generator Mode
0
1
C/T = T2CON.1
0
1
DCEN = 1
- 58 -
Up Counting Reload Value
Down Counting Reload Value
RCAP2L
0FFh
TL2
RCAP2L
TL2
RCAP2H
0FFh
TH2
RCAP2H
TH2
T2CON.6
EXF2
/
T2CON
W77E058A
TF2
2 bit in T2CON is
overflow
Timer 2
T2CON.6
EXF2
.7
Interrupt
Timer 2
Interrupt
Timer 2