UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 278

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

9.4 Operation of 8-Bit Timers H0 and H1
9.4.1 Operation as interval timer/square-wave output
is generated and the 8-bit timer counter Hn is cleared to 00H.
the CMP1n register is not detected even if the CMP1n register is set, timer output is not affected.
is output from TOHn.
278
TMHMDn
When the 8-bit timer counter Hn and compare register 0n (CMP0n) match, an interrupt request signal (INTTMHn)
Compare register 1n (CMP1n) is not used in interval timer mode. Since a match of the 8-bit timer counter Hn and
By setting bit 0 (TOENn) of timer H mode register n (TMHMDn) to 1, a square wave of any frequency (duty = 50%)
<1> Set each register.
<2> Count operation starts when TMHEn = 1.
<3> When the values of the 8-bit timer counter Hn and the CMP0n register match, the INTTMHn signal is
<4> Subsequently, the INTTMHn signal is generated at the same interval. To stop the count operation, clear
Remarks 1. For the setting of the output pin, see 9.3 (3) Port mode register 1 (PM1).
Setting
(i) Setting timer H mode register n (TMHMDn)
(ii) CMP0n register setting
generated and the 8-bit timer counter Hn is cleared to 00H.
TMHEn to 0.
TMHEn
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 INTTMHn signal interrupt, see CHAPTER 19 INTERRUPT FUNCTIONS.
3. n = 0, 1
0
Figure 9-9. Register Setting During Interval Timer/Square-Wave Output Operation
CKSn2
0/1
CKSn1
0/1
CNT
CHAPTER 9 8-BIT TIMERS H0 AND H1
CKSn0
0/1
User’s Manual U17260EJ6V0UD
TMMDn1
0
TMMDn0 TOLEVn
0
0/1
TOENn
0/1
Timer output setting
Default setting of timer output level
Interval timer mode setting
Count clock (f
Count operation stopped
CNT
) selection