CHAPTER 11 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
User’s Manual U16899EJ2V0UD
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(2) Port mode register 14 (PM14)
This register sets port 14 input/output in 1-bit units.
When using the P140/INTP6/PCL pin for clock output and the P141/INTP7/BUZ pin for buzzer output, set
PM140, PM141 and the output latch of P140, P141 to 0.
PM14 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM14 to FFH.
Figure 11-3. Format of Port Mode Register 14 (PM14)
Address: FF2EH After reset: FFH R/W
Symbol
7 6 5 4 3 2 1 0
PM14 1 1 1 1 1 1
PM141
PM140
PM14n
P14n pin I/O mode selection (n = 0, 1)
0
Output mode (output buffer on)
1
Input mode (output buffer off)
11.4 Clock Output/Buzzer Output Controller Operations
11.4.1 Clock output operation
The clock pulse is output as the following procedure.
<1> Select the clock pulse output frequency with bits 0 to 3 (CCS0 to CCS3) of the clock output selection register
(CKS) (clock pulse output in disabled status).
<2> Set bit 4 (CLOE) of CKS to 1 to enable clock output.
Remark The clock output controller is designed not to output pulses with a small width during output
enable/disable switching of the clock output. As shown in Figure 11-4, be sure to start output from the
low period of the clock (marked with * in the figure). When stopping output, do so after securing high
level of the clock.
Figure 11-4. Remote Control Output Application Example
CLOE
Clock output
*
*
11.4.2 Operation as buzzer output
The buzzer frequency is output as the following procedure.
<1> Select the buzzer output frequency with bits 5 and 6 (BCS0, BCS1) of the clock output selection register
(CKS) (buzzer output in disabled status).
<2> Set bit 7 (BZOE) of CKS to 1 to enable buzzer output.
Содержание MuPD78F0132H
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