AT89LP4052 Atmel Corporation, AT89LP4052 Datasheet - Page 28

• Manufacturer Part Number: AT89LP4052
• Manufacturer: Atmel Corporation

Specifications of AT89LP4052

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 15
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 2
• Isp: SPI
• Watchdog: Yes

.
Table 16-2.
28
Gate
C/T
M1
M0
TMOD = 89H
Not Bit Addressable
AT89LP2052/LP4052
Gating control: when set Timer/Counter x is enabled only
while INTx pin is high and TRx control pin is set. When
cleared, Timer x is enabled whenever TRx control bit
is set.
Timer or Counter Selector: cleared for Timer operation
(input from internal system clock). Set for Counter
operation (input from Tx input pin).
Mode bit 1
Mode bit 0
M1
0
0
1
1
1
Timer SFR
TCON
TMOD
TL0
TL1
TH0
TH1
TCONB
RL0
RL1
RH0
RH1
TMOD: Timer/Counter Mode Control Register
GATE
7
M0
0
1
0
1
1
.
C/T
6
Timer1
Mode
0
1
2
3
3
Purpose
Control
Mode
Timer 0 low-byte
Timer 1 low-byte
Timer 0 high-byte
Timer 1 high-byte
Mode
Timer 0 reload low-byte
Timer 1 reload low-byte
Timer 0 reload high-byte
Timer 1 reload high-byte
M1
5
Operating Mode
Variable 9 - 16-bit Timer/Counter.
8-bit Timer/Counter THz with TLx as 1 - 8-bit prescaler.
16-bit Auto Reload Timer/Counter.
8-bit Timer/Counters THx and TLx are cascaded; there is no prescaler.
8-bit Auto Reload Timer/Counter.
8-bit auto-reload Timer/Counter THx holds a value which is to be
reloaded into TLx each time it overflows.
Split Timer/Counter.
(Timer 0) TL0 is an 8-bit Timer/Counter controlled by the standard
Timer 0 control bits. TH0 is an 8-bit timer only controlled by Timer 1
control bits.
(Timer 1) Timer/Counter 1 stopped.
M0
4
GATE
3
Address
8CH
8DH
88H
89H
8AH
8BH
91H
92H
93H
94H
95H
Timer 0 gate bit
Timer 0 counter/timer select bit
Timer 0 M1 bit
Timer 0 M0 bit
C/T
2
Timer0
Reset Value = 0000 0000B
M1
Bit-Addressable
1
Yes
No
No
No
No
No
No
No
No
No
No
M0
0
3547J–MICRO–10/09