tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 34
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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2.3 System clock controller
2. CPU Core
RA001
Clock for high-frequency clock
Clock for low-frequency clock
2.3.4 Warm-up counter
oscillation circuit (fc)
oscillation circuit (fs)
and it consists of a source clock selection circuit, a 3-stage frequency division circuit and a 14-stage counter.
becomes stable and secure the time after the STOP mode is released or the operation mode is changed before
the oscillation by the oscillation circuit becomes stable.
The warm-up counter is a circuit that counts the high-frequency clock (fc) and the low-frequency clock (fs),
The warm-up counter is used to secure the time after a power-on reset is released before the supply voltage
2. Prescaler and divider
3. Machine cycle
A
B
base timer and other peripheral circuits.
of the divider becomes the output of stage 8 of the divider.
divider becomes fs/4. When SYSCR2<SYSCK> is "1", the outputs of stages 1 to 8 of the
divider and prescaler are stopped.
tion that follows the release of STOP mode.
corresponds to one main system clock.
ranging from 1-cycle instructions, which require one machine cycle for execution, to 10-
cycle instructions, which require 10 machine cycles for execution, and 13-cycle instructions,
which require 13 machine cycles for execution.
S
Z
These circuits divide fcgck. The divided clocks are supplied to the timer counter, the time
When both SYSCR1<DV9CK> and SYSCR2<SYSCK> are "0", the input clock to stage 9
When SYSCR1<DV9CK> or SYSCR2<SYSCK> is "1", the input clock to stage 9 of the
The prescaler and divider are cleared to "0" at a reset and at the end of the warm-up opera-
Instruction execution is synchronized with the main system clock (fm).
The minimum instruction execution unit is called a "machine cycle". One machine cycle
There are a total of 11 different types of instructions for the TLCS-870/C1 Series: 10 types
Figure 2-6 Warm-up Counter Circuit
1 2 3
WUCSEL WUCDIV
WUCCR
D
C
B
A
S
Z
Page 20
Enable/disable counting up
WUCRST
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Warm-up counter
XEN XTEN
controller
0 1 2 3 4 5 6 7
SYSCR2
WUCDR
Com-
parator
STOP
Enable CPU operation
SYSCR1
INTWUC interrupt
TMP89FM42
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