W77E058A40DL Nuvoton Technology Corporation of America, W77E058A40DL Datasheet - Page 52

• 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

Timer/Counter 0 and bit 6 of TMOD selects the function for Timer/Counter 1. In addition each
Timer/Counter can be set to operate in any one of four possible modes. The mode selection is done
by bits M0 and M1 in the TMOD SFR.
13.2 Time-base Selection
The W77E58 gives the user two modes of operation for the timer. The timers can be programmed to
operate like the standard 8051 family, counting at the rate of 1/12 of the clock speed. This will ensure
that timing loops on the W77E58 and the standard 8051 can be matched. This is the default mode of
operation of the W77E58 timers. The user also has the option to count in the turbo mode, where the
timers will increment at the rate of 1/4 clock speed. This will straight-away increase the counting
speed three times. This selection is done by the T0M and T1M bits in CKCON SFR. A reset sets these
bits to 0, and the timers then operate in the standard 8051 mode. The user should set these bits to 1 if
the timers are to operate in turbo mode.
13.2.1 Mode 0
In Mode 0, the timer/counters act as a 8 bit counter with a 5 bit, divide by 32 pre-scale. In this mode
we have a 13 bit timer/counter. The 13 bit counter consists of 8 bits of THx and 5 lower bits of TLx.
The upper 3 bits of TLx are ignored.
The negative edge of the clock increments the count in the TLx register. When the fifth bit in TLx
moves from 1 to 0, then the count in the THx register is incremented. When the count in THx moves
from FFh to 00h, then the overflow flag TFx in TCON SFR is set. The counted input is enabled only if
TRx is set and either GATE = 0 or INTx = 1. When C T
and if C T
timer 1. When the 13 bit count reaches 1FFFh the next count will cause it to roll-over to 0000h. The
timer overflow flag TFx of the relevant timer is set and if enabled an interrupts will occur. Note that
when used as a timer, the time-base may be either clock cycles/12 or clock cycles/4 as selected by
the bits TxM of the CKCON SFR.
div. by 4
div. by 64
div. by 1024 osc/256
M ode
Clock Source
(GATE = T M OD.7)
GATE = T M OD.3
(TR1 = TCON.6)
TR0 = TCON.4
(T1 = P3.5)
(INT1 = P3.3)
/
T0 = P3.4
INT0 = P3.2
osc/1
osc/16
is set to 1, then it will count 1 to 0 transitions on T0 (P3.4) for timer 0 and T1 (P3.5) for
input
(T 1M = CKCON.4)
T 0M = CKCON.3
1/12
1/4
1
0
Figure 11. Timer/Counter Mode 0 & Mode 1
(C/T = TM OD.6)
C/T = TM OD.2
0
1
- 52 -
0
/
Timer 1 functions are shown in brackets
is set to 0, then it will count clock cycles,
(TL1)
TL0
4
(M 1,M 0 = TM OD.5,TM OD.4)
M 1,M 0 = TM OD.1,TM OD.0
7
(TF1)
TFx
TF0
00
01
0
Interrupt
(TH1)
TH0
W77E58
7