AT89C5132 Atmel Corporation, AT89C5132 Datasheet - Page 25

• Manufacturer Part Number: AT89C5132
• Manufacturer: Atmel Corporation

Specifications of AT89C5132

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-12C
• Max I/o Pins: 44
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Uart: 1
• Adc Channels: 2
• Adc Resolution (bits): 10
• Adc Speed (ksps): 22.7
• Sram (kbytes): 2.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 3.6
• Timers: 2
• Isp: UART/USB
• Watchdog: Yes

4173E–USB–09/07
External memory cycle takes 6 CPU clock periods. This is equivalent to 12 oscillator clock peri-
ods in standard mode or 6 oscillator clock periods in X2 mode. For further information on X2
mode, refer to the section “X2 Feature”, page 12.
Slow peripherals can be accessed by stretching the read and write cycles. This is done using the
M0 bit in AUXR register. Setting this bit changes the width of the RD and WR signals from 3 to
15 CPU clock periods.
For simplicity, the accompanying figures depict the bus cycle waveforms in idealized form and
do not provide precise timing information. For bus cycle timing parameters refer to the section
“AC Characteristics”.
Figure 8-4.
Notes:
Figure 8-5.
Notes:
1. RD signal may be stretched using M0 bit in AUXR register.
2. When executing MOVX @Ri instruction, P2 outputs SFR content.
3. When executing MOVX @DPTR instruction, if DPHDIS is set (Page Access Mode), P2 out-
1. WR signal may be stretched using M0 bit in AUXR register.
2. When executing MOVX @Ri instruction, P2 outputs SFR content.
3. When executing MOVX @DPTR instruction, if DPHDIS is set (Page Access Mode), P2 out-
CPU Clock
CPU Clock
puts SFR content instead of DPH.
puts SFR content instead of DPH.
WR
External Data Read Waveforms
External Data Write Waveforms
RD
ALE
ALE
P0
P2
(1)
P0
P2
(1)
P2
P2
DPL or Ri
DPL or Ri
DPH or P2
DPH or P2
(2),(3)
(2),(3)
D7:0
D7:0
AT89C5132
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