Philips CEM2100/00, Service Manual

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Page 120
11. 8-Bit TimerCounter (TC5, TC6)
11.1 Configuration
T
5CL8
11.2 TimerCounter Control
The TimerCounter 5 is controlled by the TimerCounter 5 control register (TC5CR) and two 8-bit timer registers
(TTREG5, PWREG5).
Note 1: Do not change the timer register (TTREG5) setting while the timer is running.
Note 2: Do not change the timer register (PWREG5) setting in the operating mode except the 8-bit and 16-bit PWM modes while
the timer is running.
Note 1: fc: High-frequency clock [Hz] fs: Low-frequency clock[Hz]
Note 2: Do not change the TC5M, TC5CK and TFF5 settings while the timer is running.
Note 3: To stop the timer operation (TC5S= 1
→
0), do not change the TC5M, TC5CK and TFF5 settings. To start the timer opera-
tion (TC5S= 0
→
1), TC5M, TC5CK and TFF5 can be programmed.
Note 4: To use the TimerCounter in the 16-bit mode, set the operating mode by programming TC6CR<TC6M>, where TC5M must
be fixed to 011.
Note 5: To use the TimerCounter in the 16-bit mode, select the source clock by programming TC5CK. Set the timer start control
and timer F/F control by programming TC6CR<TC6S> and TC6CR<TFF6>, respectively.
Note 6: The operating clock settings are limited depending on the timer operating mode. For the detailed descriptions, see Table
11-1 and Table 11-2.
TimerCounter 5 Timer Register
TTREG5
(0016H)
R/W
7 6 5 4 3 2 1 0
(Initial value: 1111 1111)
PWREG5
(001AH)
R/W
7 6 5 4 3 2 1 0
(Initial value: 1111 1111)
TimerCounter 5 Control Register
TC5CR
(0029H)
7 6 5 4 3 2 1 0
TFF5 TC5CK TC5S TC5M (Initial value: 0000 0000)
TFF5 Time F/F5 control
0:
1: Clear
Set
R/W
TC5CK Operating clock selection [Hz]
NORMAL1/2, IDLE1/2 mode SLOW1/2
SLEEP1/2
mode
R/W
DV7CK = 0 DV7CK = 1
000
fc/2
11
fs/2
3
fs/2
3
001
fc/2
7
fc/2
7
–
010
fc/2
5
fc/2
5
–
011
fc/2
3
fc/2
3
–
100 fs fs fs
101 fc/2 fc/2 –
110 fc fc fc (Note 8)
111 TC5 pin input
TC5S TC5 start control
0:
1: Operation stop and counter clear
Operation start
R/W
TC5M TC5M operating mode select
000:
001:
010:
011:
1**:
8-bit timer/event counter mode
8-bit programmable divider output (PDO) mode
8-bit pulse width modulation (PWM) output mode
16-bit mode
(Each mode is selectable with TC6M.)
Reserved
R/W