upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 201

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

8.4 Operation of 8-Bit Timer H1
8.4.1 Operation as interval timer/square-wave output
generated and 8-bit timer counter H1 is cleared to 00H.
CMP11 register is not detected even if the CMP11 register is set, timer output is not affected.
is output from TOH1.
TMHMD1
When 8-bit timer counter H1 and compare register 01 (CMP01) match, an interrupt request signal (INTTMH1) is
Compare register 11 (CMP11) is not used in interval timer mode. Since a match of 8-bit timer counter H1 and the
By setting bit 0 (TOENn) of timer H mode register 1 (TMHMD1) to 1, a square wave of any frequency (duty = 50%)
<1> Set each register.
<2> Count operation starts when TMHE1 = 1.
<3> When the values of 8-bit timer counter H1 and the CMP01 register match, the INTTMH1 signal is generated
<4> Subsequently, the INTTMH1 signal is generated at the same interval. To stop the count operation, clear
Remarks 1. For the setting of the output pin, see 8.3 (3) Port mode register 1 (PM1).
Setting
(i) Setting timer H mode register 1 (TMHMD1)
(ii) CMP01 register setting
and 8-bit timer counter H1 is cleared to 00H.
TMHE1 to 0.
TMHE1
The interval time is as follows if N is set as a comparison value.
• Interval time = (N +1)/f
2. For how to enable the INTTMH1 signal interrupt, see CHAPTER 13 INTERRUPT FUNCTIONS.
0
Figure 8-7. Register Setting During Interval Timer/Square-Wave Output Operation
CKS12
0/1
CKS11
0/1
CNT
CKS10
Preliminary User’s Manual U19014EJ1V0UD
0/1
CHAPTER 8 8-BIT TIMER H1
TMMD11
0
TMMD10 TOLEV1
0
0/1
TOEN1
0/1
Timer output setting
Default setting of timer output level
Interval timer mode setting
Count clock (f
Count operation stopped
CNT
) selection
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