T89C5115 ATMEL Corporation, T89C5115 Datasheet - Page 49
T89C5115
Manufacturer Part Number
T89C5115
Description
Low Pin Count 8-bit MCU with A/D Converter and 16-Kbytes of Flash Memory
Manufacturer
ATMEL Corporation
Datasheet
1.T89C5115.pdf
(105 pages)
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Mode 0 (13-bit Timer)
Figure 22. Timer/Counter x (x= 0 or 1) in Mode 0
Mode 1 (16-bit Timer)
Figure 23. Timer/Counter x (x= 0 or 1) in Mode 1
4128A–8051–04/02
see the “Clock” section
INTx#
INTx#
see the “Clock” section
CLOCK
CLOCK
FTx
Tx
FTx
Tx
TMOD reg
GATEx
TMOD reg
GATEx
÷ 6
÷ 6
TMOD reg
TMOD reg
C/Tx#
C/Tx#
Mode 0 configures Timer 0 as an 13-bit Timer which is set up as an 8-bit Timer (TH0
register) with a modulo 32 prescaler implemented with the lower five bits of TL0 register
(see Figure 22). The upper three bits of TL0 register are indeterminate and should be
ignored. Prescaler overflow increments TH0 register.
Mode 1 configures Timer 0 as a 16-bit Timer with TH0 and TL0 registers connected in
cascade (see Figure 23). The selected input increments TL0 register.
0
1
0
1
TCON reg
TCON reg
TRx
TRx
(8 bits)
(8 bits)
THx
THx
(8 bits)
(5 bits)
TLx
TLx
Overflow
Overflow
TCON reg
TCON reg
TFx
TFx
T89C5115
Timer x
Interrupt
Request
Timer x
Interrupt
Request
49
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