SL11R Cypress Semiconductor Corp, SL11R Datasheet - Page 27

• Manufacturer Part Number: SL11R
• Description: IC MCU FULL SPD USB 16B 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of SL11R

• Applications: USB Microcontroller
• Core Processor: RISC
• Program Memory Type: Mask ROM (6 kB)
• Controller Series: USB Controller
• Ram Size: 3Kx8
• Interface: 2-Wire Serial, UART, USB
• Number Of I /o: 32
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 65°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1462

All these vector interrupts are read/write accessible. User can overwrite these default software interrupt vectors by replacing the
user’s interrupt service subroutine.
4.12
The SL11R Controller UART port supports a range of baud rates from 900 Baud up to 115.2K Baud. Baud Rate selection is made
in the UART Control Register. Buffer status can be monitored in the UART Status Register. Transmit and receive data is written
or read from the UART data register. The UART timers are independent of the general-purpose timers. The UART will cause
“edge trigger” type interrupts when the receive buffer becomes FULL or the transmit buffer becomes EMPTY.
The SL11R BIOS uses the UART port for the software debugging process. It is recommended that the user include this interface
in their hardware design. A simple 4-pin header may be used to connect to a serial cable equipped with a MAX202 transceiver.
The SL11R BIOS uses GPIO28 for data transmit (TX) and GPIO27 for data receive (RX). These two pins cannot be used for
any other purpose.
Note: On reset, the SL11R BIOS will configure the UART to operate at 14,400 baud. Other parameters are: 1 stop bit, 8 data bits,
no parity.
4.12.1
The SL11R allocates two General Purpose I/O signals for the UART function. They are GPIO28 (UART_TXD) and GPIO27
(UART_RXD). On reset, the SL11R BIOS will default this register to the value of 0x000b (i.e. UART Enable and Baud = 14.4K
Baud).
Document #: 38-08006 Rev. **
Baud Rate
D15-D5
D4
D3-1
000
001
010
011
100
101
110
111
UART Interface.
UART Control Register (0xC0E0: R/W)
D15
0
D14
0
Selector Bits.
115.2K Baud
57.6K Baud
38.4K Baud
28.8K Baud
19.2K Baud
14.4K Baud
Reserved bits
DIV8
B2-0
9.6K Baud
7.2K Baud
D13
0
VCC
D12
0
Set to all zeros.
Acts as a pre-scaler if set to ‘1’, divides the clock by 8 before generating the UART clock.
D11
0
with /8 Prescaler
Figure 4-3. UART Port Connection
14.4K Baud
7.2K Baud
4.8K Baud
3.6K Baud
2.4K Baud
1.8K Baud
1.2K Baud
0.9K Baud
D10
0
D9
0
D8
0
D7
0
D6
0
D5
0
DIV8
D4
D3
B2
D2
B1
D1
B0
D0
E
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SL11R