TMP86C909XB Toshiba, TMP86C909XB Datasheet - Page 19

• Manufacturer Part Number: TMP86C909XB
• Description: EMULATION CHIP FOR TMP86F SDIP
• Manufacturer: Toshiba

Specifications of TMP86C909XB

• Accessory Type: Adapter
• For Use With/related Products: TMP86F SDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.2 System Clock Controller
Example :Clears RAM to “00H”. (TMP86F409NG)
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.
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-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 data memory contents become unstable when the power supply is turned on; therefore, the data memory
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
TMP86F409NG