MC908KX2MDWE Datasheet, PDF (165/210 Pages) Freescale Semiconductor, Inc – High-performance M68HC08 architecture, Fully upward-compatible object code with M6805, M146805, and M68HC05 Families

I/O Registers
15.8.3 TIM Counter Modulo Registers
The read/write TIM modulo registers (TMODH and TMODL) contain the modulo value for the TIM counter.
When the TIM counter reaches the modulo value, the overflow flag (TOF) becomes set, and the TIM
counter resumes counting from $0000 at the next timer clock. Writing to the high byte (TMODH) inhibits
the TOF bit and overflow interrupts until the low byte (TMODL) is written. Reset sets the TIM counter
modulo registers.
Register name and address: TMODH — $0023
Bit 7
6
5
4
3
2
Read:
Bit 15
14
13
12
11
10
Write:
Reset: 1
1
1
1
1
1
1
Bit 0
9
Bit 8
1
1
Register name and address: TMODL — $0024
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset: 1
1
1
1
1
1
1
1
Figure 15-7. TIM Counter Modulo Registers (TMODH and TMODL)
NOTE
Reset the TIM counter before writing to the TIM counter modulo registers.
15.8.4 TIM Channel Status and Control Registers
Each of the TIM channel status and control registers (TSC0 and TSC1):
• Flags input captures and output compares
• Enables input capture and output compare interrupts
• Selects input capture, output compare, or PWM operation
• Selects high, low, or toggling output on output compare
• Selects rising edge, falling edge, or any edge as the active input capture trigger
• Selects output toggling on TIM overflow
• Selects 0 percent and100 percent PWM duty cycle
• Selects buffered or unbuffered output compare/PWM operation
Register name and address: TSC0 — $0025
Bit 7
6
5
Read: CH0F
Write: 0
CH0IE
MS0B
Reset: 0
0
0
4
MS0A
0
3
ELS0B
0
2
ELS0A
0
1
TOV0
0
Bit 0
CH0MAX
0
Register name and address: TSC1 — $0028
Bit 7
6
5
Read: CH1F
0
CH1IE
Write: 0
Reset: 0
0
0
= Unimplemented
4
MS1A
0
3
ELS1B
0
2
ELS1A
0
1
TOV1
0
Bit 0
CH1MAX
0
Figure 15-8. TIM Channel Status and Control Registers (TSCO and TSC1)
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
Freescale Semiconductor
165