AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 311

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• 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: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

machine cycle after the 8th bit is shifted in, the RI_0 (or RI_1) bit is set and reception stops
until the software clears the RI bit.
Figure C-7.through Figure C-10.illustrate Serial Port Mode 0 transmit and receive timing for
both low-speed (CLK24/12) and high-speed (CLK24/4) operation.
EZ-USB TRM v1.9
SCON0.7
SCON0.6
SCON0.5
SCON0.4
SCON0.3
SCON0.2
SCON0.1
SCON0.0
Bit
Appendix C: 8051 Hardware Description
Table C-8. SCON0 Register - SFR 98h
SM0_0 - Serial Port 0 mode bit 0.
SM0_0
and 3, this bit enables the multiprocessor communication
feature. If SM2_0 = 1 in mode 2 or 3, then RI_0 will not be
activated if the received 9th bit is 0.
If SM2_0=1 in mode 1, then RI_0 will only be activated if a
valid stop is received. In mode 0, SM2_0 establishes the
baud rate: when SM2_0=0, the baud rate is CLK24/12; when
SM2_0=1, the baud rate is CLK24/4.
enabled.
modes 2 and 3.
9th bit received. In mode 1, RB8_0 indicates the state of the
received stop bit. In mode 0, RB8_0 is not used.
word has been shifted out. In mode 0, TI_0 is set at the end
of the 8th data bit. In all other modes, TI_0 is set when the
stop bit is placed on the TXD0 pin. TI_0 must be cleared by
firmware.
has been received. In mode 0, RI_0 is set at the end of the 8th
data bit. In mode 1, RI_0 is set after the last sample of the
incoming stop bit, subject to the state of SM2_0. In modes 2
and 3, RI_0 is set at the end of the last sample of RB8_0.
RI_0 must be cleared by firmware.
SM1_0 - Serial Port 0 mode bit 1, decoded as:
SM2_0 - Multiprocessor communication enable. In modes 2
REN_0 - Receive enable. When REN_0=1, reception is
TB8_0 - Defines the state of the 9th data bit transmitted in
RB8_0 - In modes 2 and 3, RB8_0 indicates the state of the
TI_0 - Transmit interrupt flag. indicates that the transmit data
RI_0 - Receive interrupt flag. Indicates that serial data word
0
0
1
1
SM1_0
0
1
0
1
Mode
0
1
2
3
Function
C - 15