UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 62

• Manufacturer Part Number: UPSD3234A-40U6T
• Description: IC MCU 8032 64KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3234A-40U6T

• Core Processor: 8032
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, UART/USART, USB
• Peripherals: LVR, POR, PWM, WDT
• Number Of I /o: 46
• Program Memory Size: 288KB (288K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Timer/counters (Timer 0, Timer 1 and Timer 2)
11.1.4
11.2
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Mode 3
Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0.
Timer 0 in Mode 3 establishes TL0 and TH0 as two separate counters. The logic for Mode 3
on Timer 0 is shown in
and TF0. TH0 is locked into a timer function (counting machine cycles) and takes over the
use of TR1 and TF1 from Timer 1. Thus, TH0 now controls the “Timer 1“ Interrupt.
Mode 3 is provided for applications requiring an extra 8-bit timer on the counter. With Timer
0 in Mode 3, an UPSD323xx devices can look like it has three Timer/Counters. When Timer
0 is in Mode 3, Timer 1 can be turned on and off by switching it out of and into its own Mode
3, or can still be used by the serial port as a baud rate generator, or in fact, in any application
not requiring an interrupt.
Figure 23. Timer/counter mode 3: two 8-bit counters
Timer 2
Like Timers 0 and 1, Timer 2 can operate as either an event timer or as an event counter.
This is selected by Bit C/T2 in the special function register T2CON. It has three operating
modes: Capture, Auto-reload, and Baud Rate Generator, which are selected by bits in the
T2CON as shown in
by Bit EXEN2 in T2CON. if EXEN2 = 0, then Timer 2 is a 16-bit timer or counter which upon
overflowing sets Bit TF2, the Timer 2 Overflow bit, which can be used to generate an
interrupt. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a
1-to-0 transition at external input T2EX causes the current value in the Timer 2 registers,
TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively. In addition,
the transition at T2EX causes Bit EXF2 in T2CON to be set, and EXF2 like TF2 can
generate an interrupt. The Capture mode is illustrated in
In the Auto-reload mode, there are again two options, which are selected by bit EXEN2 in
T2CON. If EXEN2 = 0, then when Timer 2 rolls over it not only sets TF2 but also causes the
Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2L and RCAP2H,
which are preset by software. If EXEN2 = 1, then Timer 2 still does the above, but with the
added feature that a 1-to-0 transition at external input T2EX will also trigger the 16-bit reload
INT0 pin
Gate
T0 pin
f
f
OSC
OSC
Table
TR0
Figure
÷ 12
÷ 12
41. In the Capture mode there are two options which are selected
23. TL0 uses the Timer 0 control Bits: C/T, GATE, TR0, INT0,
C/T = 0
C/T = 1
TR1
Control
Control
UPSD3234A, UPSD3234BV, UPSD3233B,
(8 bits)
(8 bits)
TH1
TL0
Figure
24.
TF0
TF1
Interrupt
Interrupt
AI06624