AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 302

• 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

C.2.5 Mode 2
Mode 2 operation is the same for Timer 0 and Timer 1. In mode 2, the timer is configured as
an 8-bit counter, with automatic reload of the start value. The LSB register (TL0 or TL1) is the
counter and the MSB register (TH0 or TH1) stores the reload value.
As illustrated in Figure C-2., mode 2 counter control is the same as for mode 0 and mode 1.
However, in mode 2, when TLn increments from FFh, the value stored in THn is reloaded into
TLn.
C - 6
T0 (or T1) pin
(or INT1# pin)
CLK24
INT0# pin
GATE
TR0 (or TR1)
Divide by 12
Divide by 4
Appendix C: 8051 Hardware Description
Figure C-2. Timer 0/1 - Mode 2
1
0
T0M (or T1M)
C/ T
0
1
CLK
0
0
TL0 (or TL1)
TH0 (or TH1)
TF0 (or TF1)
(Timer 1 only)
To Serial Port
EZ-USB TRM v1.9
7
7
RELOAD
INT