AT89C5115 Atmel Corporation, AT89C5115 Datasheet - Page 60

• Manufacturer Part Number: AT89C5115
• Manufacturer: Atmel Corporation

Specifications of AT89C5115

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 20
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 0.5
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

60
AT89C5115
Table 38. TMOD Register
TMOD (S:89h)
Timer/Counter Mode Control Register
Reset Value = 0000 0000b
Notes:
Table 39. TH0 Register
TH0 (S:8Ch)
Timer 0 High Byte Register
Reset Value = 0000 0000b
Number
Number
GATE1
Bit
Bit
7:0
7
7
7
6
5
4
3
2
1
0
1. Reloaded from TH1 at overflow.
2. Reloaded from TH0 at overflow.
Mnemonic Description
Mnemonic Description
C/T1#
GATE1
GATE0
C/T1#
C/T0#
M01
M10
M00
M11
Bit
Bit
6
6
Timer 1 Gating Control bit
Clear to enable Timer 1 whenever TR1 bit is set.
Set to enable Timer 1 only while INT1# pin is high and TR1 bit is set.
Timer 1 Counter/Timer Select bit
Clear for Timer operation: Timer 1 counts the divided-down system clock.
Set for Counter operation: Timer 1 counts negative transitions on external pin T1.
Timer 1 Mode Select bits
M11 M01 Operating mode
Timer 0 Gating Control bit
Clear to enable Timer 0 whenever TR0 bit is set.
Set to enable Timer/Counter 0 only while INT0# pin is high and TR0 bit is set.
Timer 0 Counter/Timer Select bit
Clear for Timer operation: Timer 0 counts the divided-down system clock.
Set for Counter operation: Timer 0 counts negative transitions on external pin T0.
Timer 0 Mode Select bit
M10 M00 Operating mode
TH0 is an 8-bit Timer using Timer 1’s TR0 and TF0 bits.
High Byte of Timer 0
0
0
1
1
0
0
1
1
M11
5
5
0
1
1
0
0
1
0
1
Mode 0: 8-bit Timer/Counter (TH1) with 5bit prescaler (TL1).
Mode 1: 16-bit Timer/Counter.
Mode 3: Timer 1 halted. Retains count.
Mode 2: 8-bit auto-reload Timer/Counter (TL1).
Mode 0: 8-bit Timer/Counter (TH0) with 5bit prescaler (TL0).
Mode 1: 16-bit Timer/Counter.
Mode 2: 8-bit auto-reload Timer/Counter (TL0).
Mode 3: TL0 is an 8-bit Timer/Counter.
M01
4
4
GATE0
3
3
C/T0#
2
2
(1)
(2)
M10
1
1
4128G–8051–02/08
M00
0
0