Oki MSM66591, User Manual

Page: 195 / 466

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MSM66591/ML66592 User's Manual
Chapter 11 Flexible Timer (FTM)
[1] Timer Registers (TMR4–TMR13)
A timer register (TMR4–TMR13) consists of 16 bits. TMR4–TMR13 are constantly
compared with the counter values specified by TMSEL, and if they match, the contents
of TMR4BF, TMR13BF are loaded to the timer registers.
TMR4–TMR13 can be read/written by the program.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), TMR4–TMR13 become
0000H.
[2] Timer Register Buffer Registers (TMR4BF–TMR13BF)
A timer register buffer register (TMR4BF–TMR13BF) consists of 16 bits. If TMR4–
TMR13 and the counter values specified by TMSEL match, the contents of TMR4BF–
TMR13BF are loaded to TMR4–TMR13.
TMR4BF–TMR13BF can be read/written by the program.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), TMR4BF–TMR13BF
become 0000H.
[3] Real-time Output Control Registers (RTOCON4–RTOCON13)
A real-time output control register (RTOCON4–RTOCON13) consists of 3 bits. If TMR4
–TMR13 and the counter values specified by TMSEL match, the content of TnBF0 (bit
1) is loaded to TnOUT (bit 0), and the content of TnBF1 (bit 2) is loaded to TnBF0 (bit
1).
Set, to TnBF0, the level for changing for the next event and set, to TnBF1, for changing
for the event after the next.
RTOCON4–RTOCON13 can be read/written by the program. However, writing to the
high-order 5 bits is invalid. "1s" are always read from the high-order 5 bits when read. If
a read-modify-write instruction, such as SB, RB and XORB, is executed to RTOCON4–
RTOCON13 just before the event generated by RTO, TnBF0 and TnOUT may not
operate normally. (n = 4–13)
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, and an operation code trap is generated), RTOCON4–RTOCON13
become F8H.
Figure 11-21 shows the configuration of RTOCON4–RTOCON13.