mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 79
mc908jl16
Manufacturer Part Number
mc908jl16
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC908JL16.pdf
(230 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
mc908jl16CDWE
Manufacturer:
Freescale
Quantity:
2 865
Part Number:
mc908jl16CDWE
Manufacturer:
FREESCALE
Quantity:
20 000
Company:
Part Number:
mc908jl16CFA
Manufacturer:
JAE
Quantity:
332
Company:
Part Number:
mc908jl16CFJE
Manufacturer:
Freescale Semiconductor
Quantity:
1 806
Company:
Part Number:
mc908jl16CFJE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
mc908jl16CFJE
Manufacturer:
FREESCALE
Quantity:
20 000
Company:
Part Number:
mc908jl16CFJER
Manufacturer:
Freescale Semiconductor
Quantity:
29 890
Company:
Part Number:
mc908jl16CFJER
Manufacturer:
Freescale
Quantity:
198
Company:
Part Number:
mc908jl16CFJER
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
mc908jl16CPE
Manufacturer:
FREESCALE
Quantity:
20 000
Part Number:
mc908jl16CSPE
Manufacturer:
FREESCALE
Quantity:
20 000
PS[2:0] — Prescaler Select Bits
6.9.2 TIM Counter Registers
The two read-only TIM counter registers contain the high and low bytes of the value in the TIM counter.
Reading the high byte (TCNTH) latches the contents of the low byte (TCNTL) into a buffer. Subsequent
reads of TCNTH do not affect the latched TCNTL value until TCNTL is read. Reset clears the TIM counter
registers. Setting the TIM reset bit (TRST) also clears the TIM counter registers.
If you read TCNTH during a break interrupt, be sure to unlatch TCNTL by reading TCNTL before exiting
the break interrupt. Otherwise, TCNTL retains the value latched during the break.
Freescale Semiconductor
These read/write bits select one of the seven prescaler outputs as the input to the TIM counter as
Table 6-2
shows. Reset clears the PS[2:0] bits.
Address: T1CNTH, $0021 and T2CNTH, $0031
Address: T1CNTL, $0022 and T2CNTL, $0032
Reset:
Reset:
Read:
Read:
Write:
Write:
PS2
0
0
0
0
1
1
1
1
Bit 15
Bit 7
Bit 7
Bit 7
0
0
Figure 6-5. TIM Counter Registers High (TCNTH)
Figure 6-6. TIM Counter Registers Low (TCNTL)
= Unimplemented
= Unimplemented
PS1
14
0
0
1
1
0
0
1
1
6
0
6
6
0
MC68HC908JL16 Data Sheet, Rev. 1.1
Table 6-2. Prescaler Selection
PS0
13
5
0
5
5
0
0
1
0
1
0
1
0
1
NOTE
12
4
0
4
4
0
Internal bus clock ÷ 16
Internal bus clock ÷ 32
Internal bus clock ÷ 64
T2CLK (for TIM2 only)
Internal bus clock ÷ 1
Internal bus clock ÷ 2
Internal bus clock ÷ 4
Internal bus clock ÷ 8
TIM Clock Source
11
3
0
3
3
0
10
2
0
2
2
0
1
9
0
1
1
0
Bit 0
Bit 8
Bit 0
Bit 0
0
0
I/O Registers
79