HE84760 Datasheet, PDF (19/31 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
HE84760
HE80000 SERIES
1
as SEG as well as KEY_SCAN
The pulse width of key-scan signal can be selected by mask options MO_SNCK[1..0].
MO_SNCK[1..0]
00
01
10
11
Key Scan Pulse Width
0.5 sck
1 sck
1.5 sck
2 sck
The strength of key-scan signal can also be selected by mask options MO_SNCK[1..0].
MO_SCDRV[1..0]
00
01
10
11
Key Scan Signal Strength
weakest
strongest
SCNO0
SGKY 24
SCNO1
SCNO2
SCNO3
SCNO17
SGKY 25
SGKY 26
SGKY 27
:
SGKY 41
47K
47K
47K
47K
SCNO18
SCNO19
SGKY 42
SGKY 43
47K
....
47K
47K
SCNI0
PRTC4
SCNI1
PRTC5
SCNI2
PRTC6
SCNI3
PRTC7
11. Timer1
The Timer1 consists of two 8-bit write-only preload registers T1H and T1L and 16-bit down counter. If
Timer1 is enabled, the counter will decrement by one with each incoming clock pulse. Timer1 interrupt
will be generated when the counter underflows - counts down to FFFFH. And the counter will be
automatically reloaded with the value of T1H and T1L.
The clock source of Timer1 is derived from slow clock “SCK” at dual clock or slow clock only mode.
And it comes from the fast clock “FCK” at fast clock only mode.
Please note that the interrupt is generated when counter counts from 0000H to FFFFH. If the value of
T1H and T1L 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 moment, interrupt will be generated immediately
and value of T1H and T1L will be loaded since it counts to FFFFH. So the T1H and T1L value should be
set before enabling Timer1.
August 15, 2003
Page 19 of 31
V1.2
This specification is subject to change without notice. Please contact sales person for the latest version before use.