UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 69

• 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: -

UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
Note:
Note:
12.2.4
Now, the baud rates in Modes 1 and 3 are determined at Timer 2’s overflow rate as follows:
Table 45.
The timer can be configured for either “timer” or “counter” operation. In the most typical
applications, it is configured for “timer” operation (C/T2 = 0). “Timer” operation is a little
different for Timer 2 when it’s being used as a baud rate generator. Normally, as a timer it
would increment every machine cycle (thus at the 1/6 the CPU clock frequency). In the
case, the baud rate is given by the formula:
where (RCAP2H, RCAP2L) is the content of RC2H and RC2L taken as a 16-bit unsigned
integer.
Timer 2 also be used as the Baud Rate Generating mode. This mode is valid only if RCLK +
TCLK = 1 in T2CON or in PCON.
A roll-over in TH2 does not set TF2, and will not generate an interrupt. Therefore, the Timer
Interrupt does not have to be disabled when Timer 2 is in the Baud Rate Generator mode.
If EXEN2 is set, a 1-to-0 transition in T2EX will set EXF2 but will not cause a reload from
(RCAP2H, RCAP2L) to (TH2, TL2). Thus when Timer 2 is in use as a baud rate generator,
T2EX can be used as an extra external interrupt, if desired.
It should be noted that when Timer 2 is running (TR2 = 1) in “timer” function in the Baud
Rate Generator mode, one should not try to READ or WRITE TH2 or TL2. Under these
conditions the timer is being incremented every state time, and the results of a READ or
WRITE may not be accurate. The RC registers may be read, but should not be written to,
because a WRITE might overlap a reload and cause WRITE and/or reload errors. Turn the
timer off (clear TR2) before accessing the Timer 2 or RC registers, in this case.
More about Mode 0
Serial data enters and exits through RxD. TxD outputs the shift clock. 8 bits are
transmitted/received: 8 data bits (LSB first). The baud rate is fixed at 1/12 the f
Mode 0 Max: 1MHz
Mode 2 Max: 375K
Modes 1, 3: 62.5K
Baud Rate
Modes 1 and 3 Baud Rate = Timer 2 Overflow Rate / 16
Modes 1 and 3 Baud Baud Rate = f
19.2K
137.5
9.6K
4.8K
2.4K
1.2K
110
110
Timer 1-generated commonly used baud rates
11.059MHz
11.059MHz
11.059MHz
11.059MHz
11.059MHz
11.059MHz
12MHz
12MHz
12MHz
12MHz
6MHz
f
OSC
SMOD
OSC
X
1
1
1
0
0
0
0
0
0
0
/ (32 x [65536 – (RCAP2H, RCAP2L)]
C/T
X
X
0
0
0
0
0
0
0
0
0
Standard serial interface (UART)
Timer 1
Mode
X
X
2
2
2
2
2
2
2
2
1
Reload Value
OSC
FEEBh
.
FDh
FDh
1Dh
FFh
FAh
F4h
E8h
72h
X
X
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