T89C5115_08 ATMEL [ATMEL Corporation], T89C5115_08 Datasheet - Page 60
T89C5115_08
Manufacturer Part Number
T89C5115_08
Description
Low Pin Count 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.T89C5115_08.pdf
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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
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