Selection Of Count Clock And Operation Mode - Fujitsu MB90480 Series Hardware Manual

25.5.3 Selection of Count Clock and Operation Mode

This section describes the selection of the count clock and the operation mode.
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Count clock selection
A timer count clock can be selected from among three types of internal clocks by setting
PWCSR: bit7 (CKS1) and bit6 (CKS0).
Table 25.5-1 shows how to select the count clock.
Table 25.5-1 Count clock selection
PWCSR/bit7, bit6: CKS1, CKS0
After reset, the divide-by-4 clock of the machine clock is initially selected.
Note:
Select the count clock before timer start.
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Selection of operation mode
The operation mode or measurement mode is selected by setting the PWCSR bits.
• Selection of the operation mode: PWCSR: bit2, bit1, bit0 (MOD2, MOD1, MOD0 bits)
Selecting the timer mode/pulse width measurement mode and specifying the measurement
edge.
• Setting the measurement mode: PWCSR: bit3 (S/C bit)
Selecting between one-shot measurement/repeated measurement or reload/one-shot
CHAPTER 25 PWC TIMER (ONLY MB90485 SERIES)
1/4 of machine clock
00
B (0.25 μs for 16 MHz machine clock) [initial value]
1/16 of machine clock
01
B (1.0 μs for 16 MHz machine clock)
1/32 of machine clock
10
B (2.0 μs for 16 MHz machine clock)
Internal count clock selected
533