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| 型号： | TMP86C847UG |
| 厂商： | Toshiba Corporation |
| 英文描述： | Zener Diode; Application: General; Pd (mW): 500; Vz (V): 15.7 to 16.5; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35 |
| 中文描述： | 8位微控制器 |
| 文件页数： | 105/160页 |
| 文件大小： | 1541K |
| 代理商： | TMP86C847UG |
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Page 97
TMP86C847UG
9.3.8
16-Bit Programmable Pulse Generate (PPG) Output Mode (TC3 and 4)
This mode is used to generate pulses with up to 16-bits of resolution. The timer counter 3 and 4 are cascad-
able to enter the 16-bit PPG mode.
The counter counts up using the internal clock or external clock. When a match between the up-counter and
the timer register (PWREG3, PWREG4) value is detected, the logic level output from the timer F/F4 is
switched to the opposite state. The counter continues counting. The logic level output from the timer F/F4 is
switched to the opposite state again when a match between the up-counter and the timer register (TTREG3,
TTREG4) value is detected, and the counter is cleared. The INTTC4 interrupt is generated at this time.
Since the initial value can be set to the timer F/F4 by TC4CR<TFF4>, positive and negative pulses can be
generated. Upon reset, the timer F/F4 is cleared to 0.
(The logic level output from the
PPG
4 pin is the opposite to the timer F/F4.)
Set the lower byte and upper byte in this order to program the timer register. (TTREG3
→
TTREG4,
PWREG3
→
PWREG4) (Programming only the upper or lower byte should not be attempted.)
For PPG output, set the output latch of the I/O port to 1.
Note 1: In the PPG mode, do not change the PWREGi and TTREGi settings while the timer is running. Since
PWREGi and TTREGi are not in the shift register configuration in the PPG mode, the new values pro-
grammed in PWREGi and TTREGi are in effect immediately after programming PWREGi and TTREGi.
Therefore, if PWREGi and TTREGi are changed while the timer is running, an expected operation may not
be obtained.
Note 2: When the timer is stopped during PPG output, the
PPG
4 pin holds the output status when the timer is
stopped. To change the output status, program TC4CR<TFF4> after the timer is stopped. Do not change
TC4CR<TFF4> upon stopping of the timer.
Example: Fixing the
PPG
4 pin to the high level when the TimerCounter is stopped
CLR (TC4CR).3: Stops the timer
CLR (TC4CR).7: Sets the
PPG
4 pin to the high level
Note 3: i = 3, 4
Two machine cycles are required for the high- or low-level pulse input to the TC3 pin. Therefore, a maxi-
mum frequency to be supplied is fc/2
4
Hz in the NORMAL1 or IDLE1 mode, and fc/2
4
to in the SLOW1/2 or
SLEEP1/2 mode.
Example :Generating a pulse with 1-ms high-level width and a period of 16.385 ms (fc = 16.0 MHz)
Setting ports
LDW
(PWREG3), 07D0H
: Sets the pulse width.
LDW
(TTREG3), 8002H
: Sets the cycle period.
LD
(TC3CR), 33H
: Sets the operating clock to fc/2
3
, and16-bit PPG mode
(lower byte).
LD
(TC4CR), 057H
: Sets TFF4 to the initial value 0, and 16-bit
PPG mode (upper byte).
LD
(TC4CR), 05FH
: Starts the timer.
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