tmp86c809ng TOSHIBA Semiconductor CORPORATION, tmp86c809ng Datasheet - Page 18
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tmp86c809ng
Manufacturer Part Number
tmp86c809ng
Description
8 Bit Microcontroller Tlcs-870/c Series
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP86C809NG.pdf
(154 pages)
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2.2 System Clock Controller
Example :Clears RAM to “00H”. (TMP86C809NG)
2.2 System Clock Controller
2.2.1 Clock Generator
The system clock controller consists of a clock generator, a timing generator, and a standby controller.
and peripheral hardware. It contains two oscillation circuits: One for the high-frequency clock and one for the
low-frequency clock. Power consumption can be reduced by switching of the standby controller to low-power
operation based on the low-frequency clock.
between the XIN/XOUT and XTIN/XTOUT pins respectively. Clock input from an external oscillator is also
possible. In this case, external clock is applied to XIN/XTIN pin with XOUT/XTOUT pin not connected.
The clock generator generates the basic clock which provides the system clocks supplied to the CPU core
The high-frequency (fc) clock and low-frequency (fs) clock can easily be obtained by connecting a resonator
SRAMCLR:
XTOUT
XOUT
XTIN
XIN
LD
LD
LD
LD
INC
DEC
JRS
High-frequency
clock oscillator
Low-frequency
clock oscillator
generator
Clock
Figure 2-2 System Colck Control
HL, 0040H
A, H
BC, 01FFH
(HL), A
HL
BC
F, SRAMCLR
fc
fs
Timing generator control register
Clock generator control
Page 8
System clocks
; Start address setup
; Initial value (00H) setup
generator
TBTCR
Timing
0036 H
0038 H
System control registers
SYSCR1
Standby controller
0039 H
SYSCR2
TMP86C809NG
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