mc9s08gt32a Freescale Semiconductor, Inc, mc9s08gt32a Datasheet - Page 164

• Manufacturer Part Number: mc9s08gt32a
• Description: Hcs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

Timer/PWM (TPM)
1. The maximum frequency that is allowed as an external clock is one-fourth of the bus frequency.
2. When the TPMxCH0 pin is selected as the TPM clock source, the corresponding ELS0B:ELS0A control bits should be set to
10.7.2
The two read-only TPM counter registers contain the high and low bytes of the value in the TPM counter.
Reading either byte (TPMxCNTH or TPMxCNTL) latches the contents of both bytes into a buffer where
they remain latched until the other byte is read. This allows coherent 16-bit reads in either order. The
coherency mechanism is automatically restarted by an MCU reset, a write of any value to TPMxCNTH or
TPMxCNTL, or any write to the timer status/control register (TPMxSC).
Reset clears the TPM counter registers.
164
0:0 so channel 0 does not try to use the same pin for a conflicting function.
Reset
Reset
W
W
R
R
Bit 15
Timer x Counter Registers (TPMxCNTH:TPMxCNTL)
Bit 7
0
0
7
7
CLKSB:CLKSA
PS2:PS1:PS0
0:0:0
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
Figure 10-6. Timer x Counter Register High (TPMxCNTH)
0:0
0:1
1:0
1:1
Figure 10-7. Timer x Counter Register Low (TPMxCNTL)
14
0
6
0
6
6
Table 10-2. TPM Clock Source Selection
Table 10-3. Prescale Divisor Selection
Any write to TPMxCNTH clears the 16-bit counter.
MC9S08GB60A Data Sheet, Rev. 1.02
Any write to TPMxCNTL clears the 16-bit counter.
13
0
5
0
5
5
12
0
4
0
4
4
No clock selected (TPM disabled)
Bus rate clock (BUSCLK)
Fixed system clock (XCLK)
External source (TPMx Ext Clk)
11
TPM Clock Source to Prescaler Input
3
0
3
3
0
TPM Clock Source Divided-By
10
0
2
0
2
2
128
16
32
64
1
2
4
8
1
,
2
Freescale Semiconductor
9
0
1
0
1
1
Bit 8
Bit 0
0
0
0
0