tmp86fh46bng TOSHIBA Semiconductor CORPORATION, tmp86fh46bng Datasheet - Page 26

• Manufacturer Part Number: tmp86fh46bng
• Description: 8 Bit Microcontroller Tlcs-870/c Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.2
System Clock Controller
Example :Clears RAM to “00H”. (TMP86FH46BNG)
2.2
2.2.1
System Clock Controller
The system clock controller consists of a clock generator, a timing generator, and a standby controller.
SRAMCLR:
ry should be initialized by an initialization routine.
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-pow-
er operation based on the low-frequency clock.
tor between the XIN/XOUT and XTIN/XTOUT pins respectively. Clock input from an external oscillator is al-
so possible. In this case, external clock is applied to XIN/XTIN pin with XOUT/XTOUT pin not connected.
Clock Generator
The data memory contents become unstable when the power supply is turned on; therefore, the data memo-
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 resona-
XTOUT
XOUT
XTIN
XIN
LD
LD
LD
LD
INC
DEC
JRS
High-frequency
clock oscillator
Low-frequency
clock oscillator
generator
Clock
HL, 0040H
A, H
BC, 01FFH
(HL), A
HL
BC
F, SRAMCLR
Figure 2-2 System Clock Control
fc
fs
Timing generator control register
Clock generator control
Page 8
; Start address setup
; Initial value (00H) setup
System clocks
generator
TBTCR
Timing
0036 H
0038 H
System control registers
SYSCR1
Standby controller
0039 H
TMP86FH46BNG
SYSCR2