參數(shù)資料
型號: UPD784915BGF
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 16位單晶片微控制器
文件頁數(shù): 37/86頁
文件大?。?/td> 384K
代理商: UPD784915BGF
μ
PD784915B, 784916B
37
(7) Up/down counter unit
The up/down counter unit is a counter that realizes a linear time counter.
This unit consists of an up/down counter (UDC) and a compare register (UDCC).
The up/down counter counts up the rising edges of PBCTL and counts down the falling edges of PBCTL. When
the value of the up/down counter coincides with the value of the compare register, or when the counter underflows,
an interrupt request is generated.
Figure 3-14. Block Diagram of Up/Down Counter Unit
(8) PWM output unit
The PWM output unit has three 16-bit accuracy output lines (PWM0, PWM1, and PWM5) and 8-bit accuracy
output lines (PWM2 to PWM4). The carrier frequency of all the output lines is 62.5 kHz (f
CLK
= 8 MHz).
PWM0 and PWM1 can be used to control the drum motor and capstan motor.
Figure 3-15. Block Diagram of 16-Bit PWM Output Unit
INTUDC
UDC
UDCC
EDVC output
S
S
S
S
PTO10
PTO11
PBCTL
P77
SELUD
UP/DOWN
Internal bus
16
8
8
8
15
8
7
0
PWMn
(n = 0, 1, 5)
Reload
To selector
Reload control
Reload
16 MHz
8-bit down counter
1/256
PWM pulse
generation circuit
8-bit counter
Output control
circuit
RESET
PWMn
PWMC0
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