AN2136SC Cypress Semiconductor Corp, AN2136SC Datasheet - Page 298

• Manufacturer Part Number: AN2136SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

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

C.2.1 803x/805x Compatibility
The implementation of the timers/counters is similar to that of the Dallas Semiconductor
DS80C320. Table C-1. summarizes the differences in timer/counter implementation between
the Intel 8051, the Dallas Semiconductor DS80C320, and the 8051 core.
C.2.2 Timers 0 and 1
Timers 0 and 1 each operate in four modes, as controlled through the TMOD SFR (Table C-2.)
and the TCON SFR (Table C-3.). The four modes are:
C.2.3 Mode 0
Mode 0 operation, illustrated in Figure C-1., is the same for Timer 0 and Timer 1. In mode 0,
the timer is configured as a 13-bit counter that uses bits 0-4 of TL0 (or TL1) and all 8 bits of
TH0 (or TH1). The timer enable bit (TR0/TR1) in the TCON SFR starts the timer. The C/T bit
selects the timer/counter clock source, CLK24 or the T0/T1
The timer counts transitions from the selected source as long as the GATE bit is 0, or the
GATE bit is 1 and the corresponding interrupt pin (INT0# or INT1#) is 1.
When the 13-bit count increments from 1FFFh (all ones), the counter rolls over to all zeros,
the TF0 (or TF1) bit is set in the TCON SFR, and the T0OUT (or T1OUT) pin goes high for
one clock cycle.
C - 2
•
•
•
•
13-bit timer/counter (mode 0)
16-bit timer/counter (mode 1)
8-bit counter with auto-reload (mode 2)
Two 8-bit counters (mode 3, Timer 0 only)
Number of timers
Timer 0/1 overflow
available as output signals
Timer 2 output enable
Timer 2 downcount enable
Timer 2 overflow available
as output signal
Feature
Table C-1. Timer/Counter Implementation Comparison
Appendix C: 8051 Hardware Description
implemented
Intel 8051
not
n/a
n/a
n/a
2
implemented
implemented
implemented
implemented
DS80C320
Dallas
not
3
pins
.
T0OUT, T1OUT
(one CLK24 pulse)
not implemented
not implemented
T2OUT
(one CLK24 pulse)
8051
3
EZ-USB TRM v1.9