UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 259

• 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

8.4 Operations of 8-Bit Timer/Event Counters 50 and 51
8.4.1 Operation as interval timer
of the count value preset to 8-bit timer compare register 5n (CR5n).
TM5n value cleared to 0 and an interrupt request signal (INTTM5n) is generated.
(TCL5n).
8-bit timer/event counter 5n operates as an interval timer that generates interrupt requests repeatedly at intervals
When the count value of 8-bit timer counter 5n (TM5n) matches the value set to CR5n, counting continues with the
The count clock of TM5n can be selected with bits 0 to 2 (TCL5n0 to TCL5n2) of timer clock selection register 5n
<1> Set the registers.
<2> After TCE5n = 1 is set, the count operation starts.
<3> If the values of TM5n and CR5n match, INTTM5n is generated (TM5n is cleared to 00H).
<4> INTTM5n is generated repeatedly at the same interval.
Caution Do not write other values to CR5n during operation.
Remarks 1. For how to enable the INTTM5n signal interrupt, see CHAPTER 19 INTERRUPT FUNCTIONS.
Remark Interval time = (N + 1) × t
Setting
TM5n count value
• TCL5n:
• CR5n:
• TMC5n:
Set TCE5n to 0 to stop the count operation.
Count clock
INTTM5n
2. n = 0, 1
N = 01H to FFH
n = 0, 1
TCE5n
CR5n
Select the count clock.
Compare value
Stop the count operation, select the mode in which clear & start occurs on a match of TM5n
and CR5n.
(TMC5n = 0000×××0B × = Don’t care)
Count start
00H
N
CHAPTER 8 8-BIT TIMER/EVENT COUNTERS 50 AND 51
01H
Figure 8-11. Interval Timer Operation Timing (1/2)
t
User’s Manual U17260EJ6V0UD
(a) Basic operation
N
Clear
00H
Interrupt acknowledged
N
01H
Interval time
N
Clear
00H
Interrupt acknowledged
N
01H
Interval time
N
N
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