upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 216

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

216
<1> When TMHE1 = 1 is set, 8-bit timer H1 starts a count operation. At that time, the carrier clock remains
<2> When the count value of 8-bit timer counter H1 matches the value of the CMP01 register, the INTTMH1
<3> The CMP11 register is asynchronous to the count clock, and its value can be changed while 8-bit timer H1 is
<4> When the count value of 8-bit timer counter H1 matches the value (M) of the CMP1 register before the
<5> The timing at which the count value of 8-bit timer counter H1 and the CMP11 register value match again is
8-bit timer counter
H1 count value
default.
signal is output, the carrier signal is inverted, and the timer counter is cleared to 00H. At the same time, the
compare register whose value is to be compared with that of 8-bit timer counter H1 is changed from the
CMP01 register to the CMP11 register.
operating. The new value (L) to which the value of the register is to be changed is latched. When the count
value of 8-bit timer counter H1 matches the value (M) of the CMP11 register before the change, the CMP11
register is changed (<3>’).
However, it takes three count clocks or more since the value of the CMP11 register has been changed until
the value is transferred to the register. Even if a match signal is generated before the duration of three count
clocks elapses, the new value is not transferred to the register.
change, the INTTMH1 signal is output, the carrier signal is inverted, and the timer counter is cleared to 00H.
At the same time, the compare register whose value is to be compared with that of 8-bit timer counter H1 is
changed from the CMP11 register to the CMP01 register.
indicated by the value after the change (L).
8-bit timer H1
Carrier clock
count clock
INTTMH1
TMHE1
CMP01
CMP11
Figure 8-13. Carrier Generator Mode Operation Timing (3/3)
<1>
00H 01H
(c) Operation when CMP11 is changed
M
Preliminary User’s Manual U19014EJ1V0UD
<2>
CHAPTER 8 8-BIT TIMER H1
N
<3>
00H 01H
M (L)
M
<4>
<3>’
00H
N
L
N
00H
01H
L
<5>
00H