UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 204

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

(4) Pulse width measurement by means of restart
204
CR01n capture value
CR00n capture value
TM0n count value
Note Clear OVF0n by software.
When input of a valid edge to the TI00n pin is detected, the count value of 16-bit timer counter 0n (TM0n) is taken
into 16-bit timer capture/compare register 01n (CR01n), and then the pulse width of the signal input to the TI00n
pin is measured by clearing TM0n and restarting the count operation.
Either of two edges⎯rising or falling⎯can be selected using bits 4 and 5 (ES0n0 and ES0n1) of prescaler mode
register 0n (PRM0n).
Sampling is performed using the count clock cycle selected by prescaler mode register 0n (PRM0n) and a
capture operation is only performed when a valid level of the TI00n pin is detected twice, thus eliminating noise
with a short pulse width.
Remark
TI00n pin input
Count clock
INTTM01n
OVF0n
Figure 7-41. Timing of Pulse Width Measurement Operation with Free-Running Counter
n = 0 to 3
0000H
t
and Two Capture Registers (with Rising Edge Specified)
0001H
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
D0
(D1
D0
User’s Manual U17554EJ4V0UD
D0 + 1
D0)
t
D1
D1
D1 + 1
(10000H
FFFFH
D1 + D2)
0000H
t
D2
(D3
D2 + 1
D2
Note
D2)
t
D3
D3