HT46R14A データシートの表示（PDF） - Holtek Semiconductor

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HT46R14A

A/D Type 8-Bit OTP MCU

Holtek Semiconductor 

HT46R14A

EX2: Since the first trigger type is raising edge after PPG starts, the PPG timer is triggered by raising edge until PPG

stops.

tS Y S

S y s te m C lo c k

S ta r t T r ig g e r

P P G P u ls e

P P G T im e r

< 0 .5 tS Y S

n

n+1 n+2

· PPG0C control register

Bit No.

7

6

5

4

3

2

1

0

PPG0C (20H)

P0ST P0RSEN P0SPEN P0PSC2 P0PSC1 P0PSC0 CMP1EN CMP0EN

POR value

0

0

0

0

0

0

0

0

CMP0EN: Enables or disables Comparator 0 (0=disable, 1=enable)

CMP1EN: Enables or disables Comparator 1 (0=disable, 1=enable)

P0PSC2, P0PSC1, P0PSC0: These three bits select the PPG0 timer prescaler rate.

P0SPEN: Enables or disables the stopping of the PPG0 timer using the C0VO trigger input (0=disable, 1=enable)

P0RSEN: Enables or disables the restarting of the PPG0 timer using the C1VO trigger input. (0=disable, 1=enable)

P0ST: PPG0 software trigger bit. (0=Stop PPG0, 1=Restart PPG0)

The CMP0EN and CMP1EN bits are used as the comparator enable or disable bits.

¨ CMP0EN= ²0² (comparator is disabled) ® PC0/C0VIN-, PC1/C0VIN+, PC2/C0OUT are all GPIO pins

¨ CMP1EN= ²0² (comparator is disabled) ® PC3/C1OUT, PC4/C1VIN+ are all GPIO.

¨ CMP0EN= ²1² (comparator is enabled) ® PC2 will be automatically set to be an input only, the PC2 output function

and the PC0/PC1/PC2 pull-high resistors are disabled automatically but PC0/PC1 will maintain their I/O function.

Software instructions determine if Comparator 0 is enabled or not.

¨ CMP1EN= ²1² (comparator is enabled) ® PC3 will be automatically set to be an input only, the PC3 output function

and the PC3/PC4 pull-high resistors will be disabled automatically but PC4 will maintain its I/O function. Software

instructions determine if Comparator 1 is enabled or not.

PPG0C: CMP1EN, CMP0EN comparator enable/disable bits

CMP0EN

Description

0

Disable the Comparator 0. PC0/C0VIN-, PC1/C0VIN+, PC2/C0OUT are all I/O pins.

1

Enable the Comparator 0. The PC0/C0VIN-, PC1/C0VIN+ are Comparator 0 input pins, PC2/C0OUT

is a Comparator 0 output pin, PC2 output disabled, PC2 Pull-high resistor disabled.

CMP1EN

Description

0

Disable the Comparator 1. PC3/C1OUT, PC4/C1VIN+ is a PGIO pin.

1

Enable the Comparator 1. The PC3/C1OUT is a Comparator 1 output pin, PC3 output disable,

PC3/PC4 Pull-high resistor disabled.

Bits2~4 of the PPG0 control register, PPG0C, can be used to define the pre-scaling stages of the PPG0 timer counter

clock.

Rev. 1.00

19

August 3, 2007

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