2 operation in 8-bit timer counter mode – NEC PD754144 User Manual
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CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
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User’s Manual U10676EJ3V0UM
6.4.2 Operation in 8-bit timer counter mode
In this mode, the timer counter is used as an 8-bit timer counter. In this case, the timer counter operates as an
8-bit programmable interval timer or counter.
(1) Register setting
In the 8-bit timer counter mode, the following four registers are used:
•
Timer counter mode register (TMn)
•
Timer counter control register (TC2)
Note
•
Timer counter count register (Tn)
•
Timer counter modulo register (TMODn)
Note
Channels 0 and 1 of the timer counter use the timer counter output enable flags (TOE0 and TOE1).
(a) Timer counter mode register (TMn)
In the 8-bit timer counter mode, set TMn as shown in Figure 6-31 (for the format of TMn, refer to Figures
6-26 to 6-28).
TMn is manipulated by an 8-bit manipulation instruction. Bit 3 is a timer start command bit which can
be manipulated in 1-bit units. This bit is automatically cleared to 0 when the timer starts operating.
TMn is cleared to 00H when the internal reset signal is asserted.
Remark n = 0 to 2