Chapter 1 Hardware Structure
No.
Oscillator Options
14
15
16
OSC type selection: RC or crystal
f
SYS
clock source: OSC or RTC oscillator
f
S
internal clock source: RTC oscillator, WDT oscillator, or f
SYS
/4
Options
Timer Options
17
18
Timer/Event Counter 0 clock source: f
SYS
or f
SYS
/4
Timer/Event Counter 1 clock source: f
SYS
, Time Base interrupt or Timer/Event Counter 0 overflow
(except HT49R30A-1/HT49C30-1/HT49C30L)
PFD Options
19
20
PA3: normal I/O or PFD output
PFD clock selection: Timer/Event Counter 0 or Timer/Event Counter 1
(except HT49R30A-1/HT49C30-1/HT49C30L)
Buzzer Options
21
22
PA0/PA1: normal I/O or buzzer function
Buzzer Frequency: f
S
/2
2
, f
S
/2
3
f
S
/2
4
, f
S
/2
5
, f
S
/2
6
, f
S
/2
7
, f
S
/2
8
, f
S
/2
9
Time Base division ratio: f
S
/2
12
, f
S
/2
13
, f
S
/2
14
, f
S
/2
15
Time Base Options
23
Watchdog Options
24
25
WDT enable or disable
CLRWDT instructions: 1 or 2 instructions
LVD/LVR Options
26
27
Low Voltage Detect: enable or disable (except HT49C30L, HT49C50L, HT49C70L)
LVR function: enable or disable (except HT49C30L, HT49C50L, HT49C70L)
Note
Not all of the listed I/O ports exist in every device, therefore correspondingly some of the listed I/O
options will not apply to some devices.
111
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