- At89c52 programmer generator#
- At89c52 programmer serial#
- At89c52 programmer drivers#
- At89c52 programmer software#
These interrupts are all shown in Figure 6.
At89c52 programmer serial#
Interrupts The AT89C52 has a total of six interrupt vectors: two exter- nal interrupts (INT0 and INT1), three timer interrupts (Timers 0, 1, and 2), and the serial port interrupt. The UART in the AT89C52 operates the same way as the UART in the AT89C51. This figure is valid only if RCLK or TCLK = 1 in T2CON.
At89c52 programmer generator#
Timer baud rate generator is shown in Figure 4.
Modes 1 and 3 - where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. Timer 2 in Clock-out Mode OSC P1.0 (T2) TRANSITION DETECTOR P1.1 (T2EX) AT89C52 10 increments every state time (at 1/2 the oscillator fre- quency). Timer 2 in Baud Rate Generator Mode NOTE: OSC. Timer 2 Auto Reload Mode (DCEN = 1) ÷ 12 OSC C/ C/ PIN Figure 4. AT89C52 8 C/ TH2 CONTROL TR2 C/ RELOAD RCAP2H CONTROL EXEN2 – – –. DCEN When set, this bit allows Timer configured as an up/down counter. Bit 7 6 Symbol Function – Not implemented, reserved for future T2OE Timer 2 Output Enable bit. In this mode, two options are selected by bit EXEN2 in T2CON. Timer in Capture Mode ÷12 OSC T2 PIN TRANSITION DETECTOR T2EX PIN Figure 2 shows Timer 2 automatically counting up when DCEN = 0. Timer 2 Timer 16-bit Timer/Counter that can operate as either a timer or an event counter. Timer 0 and 1 Timer 0 and Timer 1 in the AT89C52 operate the same way as Timer 0 and Timer 1 in the AT89C51. Note that stack operations are examples of indirect addressing, so the upper 128 bytes of data RAM are avail- able as stack space. That means the upper 128 bytes have the same addresses as the SFR space but are physically separate from SFR space.
The upper 128 bytes occupy a parallel address space to the Special Function Registers. Data Memory The AT89C52 implements 256 bytes of on-chip RAM. When either RCLK or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow. When the AT89C52 is executing code from external pro- gram memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN Program Store Enable is the read strobe to external pro- gram memory. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning.
At89c52 programmer software#
In addition, the AT89C52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. Flash, 256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full-duplex serial port, on-chip oscillator, and clock cir- cuitry.
At89c52 programmer drivers#
REGISTER B REGISTER PSEN TIMING ALE/PROG INSTRUCTION AND REGISTER CONTROL PP RST OSC AT89C52 2 P0.0 - P0.7 PORT 0 DRIVERS PORT 2 PORT 0 RAM LATCH LATCH ACC TMP2 TMP1 ALU INTERRUPT, SERIAL PORT, AND TIMER BLOCKS PSW PORT 1 LATCH PORT 1 DRIVERS P1. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. The on-chip Flash allows the program memory to be reprogrammed in-system conventional nonvolatile memory programmer. AT89C52 has an endurance of 1000 Write/Erase cycles which means that it can be erased and programmed to a maximum of 1000 times. AT89C52 has 8KB of Flash programmable and erasable read-only memory (PEROM) and 256 bytes of RAM. AT89C52 is an 8-bit microcontroller and belongs to Atmel’s 8051 families.