HE83003 Datasheet, PDF (7/23 Pages) King blillion Electronics Co.,Ltd. – 8-BIT MICRO-CONTROLLER

King Billion Electronics Co., Ltd
駿億電子股份有限公司
HE83003
HE80000 SERIES
The contents of
T1H and T1L are
almost loaded into
Timer1 immediately
when Timer1 is
enabled after reset.
T1H
T1L
< Timer1 Counter >
Decreases 1
Auto reload
when Timer1
is underflow
No
Count To
0xFFFFh
Yes
Timer1
Interrupt
Request
T1_INT
8. Timer2
Timer2 is similar in structure to Timer1 except that clock source of Timer2 comes from the system clock
“Fsys”/1.5. The system clock “Fsys” varies depending on the operation modes of the MCU.
The Timer2 consists of two 8-bit write-only preload registers T2H and T2L and 16-bit down counter. If
Timer2 is enabled, counter will decrement by one with each incoming clock pulse. Timer2 interrupt will
be generated when the counter underflows - counts down to FFFFH. And it will be automatically
reloaded with the value of T2H and T2L.
Please note that the interrupt signal is generated when counter counts from 0000H to FFFFH. If the value
of counter is N, and count down to FFFFH, the total count is N+1. The content of counter is zero when
system resets. Once it is enabled to count at this time, the interrupt will be generated immediately and
value of T2H and T2L will be loaded since the counter counts to FFFFH. So the T2H and T2L value
should be set before enabling Timer2.
The Timer2 related control registers are list as below:
Register
IER
Address
0x02
Field Bit Position Mode
TC2_IER
1
R/W
T2L
0x05
T2L[7:0]
7~0
W
T2H
0x06
T2H[7:0]
7~0
W
OP1
0x09
TC2E
3
R/W
Description
0: TC2 interrupt is disabled. (default)
1: TC2 interrupt is enabled.
Low byte of TC2 pre-load value
High byte of TC2 pre-load value
0: TC2 is disabled. (default)
1: TC2 is enabled.
September 8, 2004
7
V1.1
This specification is subject to change without notice. Please contact sales person for the latest version before use.