Datasheet
78K0/Ix2 CHAPTER 9 8-BIT TIMER H1
R01UH0010EJ0500 Rev.5.00 352
Feb 28, 2012
Setting
<1> Set each register.
Figure 9-14. Register Setting in Carrier Generator Mode
(i) Setting 8-bit timer H mode register 1 (TMHMD1)
0 0/1 0/1 0/1 0
Timer output enabled
Default setting of timer output lev
el
Carrier generator mode selection
Count clock (f
CNT
) selection
Count operation stopped
1 0/1 1
TMMD10 TOLEV1 TOEN1CKS11CKS12TMHE1
T
MHMD1
CKS10 TMMD11
(ii) CMP01 register setting
Compare value
(iii) CMP11 register setting
Compare value
(iv) TMCYC1 register setting
RMC1 = 1 ... Remote control output enable bit
NRZB1 = 0/1 ... carrier output enable bit
(v) TCL51 and TMC51 register setting
Refer to 8.3 Registers Controlling 8-Bit Timer/Event Counter 51.
<2> When TMHE1 = 1, the 8-bit timer H1 starts counting.
<3> When TCE51 of the 8-bit timer mode control register 51 (TMC51) is set to 1, the 8-bit timer/event counter 51
starts counting.
<4> After the count operation is enabled, the first compare register to be compared is the CMP01 register. When
the count value of the 8-bit timer counter H1 and the CMP01 register value match, the INTTMH1 signal is
generated, the 8-bit timer counter H1 is cleared. At the same time, the compare register to be compared with
the 8-bit timer counter H1 is switched from the CMP01 register to the CMP11 register.
<5> When the count value of the 8-bit timer counter H1 and the CMP11 register value match, the INTTMH1 signal is
generated, the 8-bit timer counter H1 is cleared. At the same time, the compare register to be compared with
the 8-bit timer counter H1 is switched from the CMP11 register to the CMP01 register.
<6> By performing procedures <4> and <5> repeatedly, a carrier clock is generated.
<7> The INTTM51 signal is synchronized with count clock of the 8-bit timer H1 and output as the INTTM5H1 signal.
The INTTM5H1 signal becomes the data transfer signal for the NRZB1 bit, and the NRZB1 bit value is
transferred to the NRZ1 bit.
<8> Write the next value to the NRZB1 bit in the interrupt servicing program that has been started by the INTTM5H1
interrupt or after timing has been checked by polling the interrupt request flag. Write data to count the next time
to the CR51 register.
<9> When the NRZ1 bit is high level, a carrier clock is output by TOH1 output.