GMS81C5108 Datasheet, PDF (47/102 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C5108
7
6
5
4
3
2
1
0
CKCTLR
-
-
-
- BCL BCK2 BCK1 BCK0
ADDRESS: 0F4_H
INITIAL VALUE: ----0111_B
Caution:
Both register are in same address,
when write, to be a CKCTLR,
when read, to be a BITR.
Basic Interval Timer source clock select
000: f_MAIN÷2³ or f_SUB÷2³
001: f_MAIN÷2⁴ or f_SUB÷2⁴
010: f_MAIN÷2⁵ or f_SUB÷2⁵
f_MAIN: main-clock frequency
011: f_MAIN÷2⁶ or f_SUB÷2⁶
100: f_MAIN÷2⁷ or f_SUB÷2⁷
101: f_MAIN÷2⁸ or fSUB÷2⁸
110: f_MAIN÷2⁹ or fSUB÷2⁹
111: f_MAIN÷2¹⁰ or fSUB÷2¹⁰
f_SUB: sub-clock frequency
Clear bit
0: Normal operation (free-run)
1: Clear 8-bit counter (BITR) to "0". This bit becomes 0 automatically
after one machine cycle.
BITR
7
6
5
4
3
2
1
0
8-BIT BINARY COUNTER
ADDRESS: 0F4_H
INITIAL VALUE: 00_H
Figure 11-2 BITR: Basic Interval Timer Mode Register
Example 1:
Interrupt request flag is generated every 8.192ms at 4MHz.
:
LDM
SET1
EI
:
CKCTLR,#0CH
BITE
44
JUNE 2001 Ver 1.0