HT37B90/HT37B70/HT37B50/HT37B30
Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the device during the program-
ming process. During the development process, these options are selected using the HT-MDS software development
tools. As these options are programmed into the device using the hardware programming tools, once they are selected
they cannot be changed later as the application software has no control over the configuration options. All options must
be defined for proper system function, the details of which are shown in the table.
No.
1
Function
Watchdog Timer: enable or disable
2
Watchdog Timer clock source: T1 (fOSC/8) or RC OSC
CLRWDT instructions: 1 or 2 instructions
3
4
PA0~PA7: wake-up enable or disable (bit option)
PA, PB, PC, PD and PE: pull-high enable or disable (port numbers are device dependent)
System oscillator: Xtal Mode or RC Mode
5
6
7
LVR function: enable or disable
LVR / LVD voltage selection
1. 3.0V/3.1V
8
9
2. 2.4V/2.5V
Share PIN - PA5/INT: enable (INT) or disable (PA5)
Share PIN - PA6/TMR0: enable (TMR0) or disable (PA6)
Share PIN - PA7/TMR1: enable (TMR1) or disable (PA7))
10 R to F Function : enable or normal I/O (PD0~PD3)
When R to F Enable, the Share PIN that using and depend on the Option.
K0/PC0
K1/PC1
K2/PC2
11 K3/PC3
K4/PC4
K5/PC5
K6/PC6
K7/PC7
IIS/PD4~6 pin option:
12 1. IIS pin
2. PD4~PD6 are IO port
UART/PE0~PE2 pin option:
13 1. UART pin
2. PE0~PE2 are IO port
SPI/PE3~PE6 pin option:
14 1. SPI pin
2. PE3~PE6 are IO port
Rev. 1.00
63
June 22, 2017
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
