AN2136SC Cypress Semiconductor Corp, AN2136SC Datasheet - Page 315
AN2136SC
Manufacturer Part Number
AN2136SC
Description
IC MCU 8051 8K RAM 24MHZ 44QFP
Manufacturer
Cypress Semiconductor Corp
Series
EZ-USB®r
Datasheet
1.AN2131SC.pdf
(334 pages)
Specifications of AN2136SC
Applications
USB Microcontroller
Core Processor
8051
Program Memory Type
ROMless
Controller Series
AN213x
Ram Size
8K x 8
Interface
I²C, USB
Number Of I /o
8
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
44-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
428-1309
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C.3.3 Mode 1
Mode 1 provides standard asynchronous, full-duplex communication, using a total of 10 bits:
1 start bit, 8 data bits, and 1 stop bit. For receive operations, the stop bit is stored in RB8_0 (or
RB8_1). Data bits are received and transmitted LSB first.
C.3.3.1
The mode 1 baud rate is a function of timer overflow. Serial Port 0 can use either Timer 1 or
Timer 2 to generate baud rates. Serial Port 1 can only use Timer 1. The two serial ports can
run at the same baud rate if they both use Timer 1, or different baud rates if Serial Port 0 uses
Timer 2 and Serial Port 1 uses Timer 1.
Each time the timer increments from its maximum count (FFh for Timer 1 or FFFFh for Timer
2), a clock is sent to the baud rate circuit. The clock is then divided by 16 to generate the baud
rate.
When using Timer 1, the SMOD0 (or SMOD1) bit selects whether or not to divide the Timer
1 rollover rate by 2. Therefore, when using Timer 1, the baud rate is determined by the
equation:
SMOD0 is SFR bit PCON.7; SMOD1 is SFR bit EICON.7.
When using Timer 2, the baud rate is determined by the equation:
To use Timer 1 as the baud rate generator, it is best to use Timer 1 mode 2 (8-bit counter with
auto-reload), although any counter mode can be used. The Timer 1 reload is stored in the TH1
register, which makes the complete formula for Timer 1:
EZ-USB TRM v1.9
Mode 1 Baud Rate
Appendix C: 8051 Hardware Description
Baud Rate =
Baud Rate =
Baud Rate =
32
2
32
SMODx
2
Timer 2 Overflow
SMODx
x
16
12 x (256 - TH1)
x Timer 1 Overflow
CLK24
C - 19
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