tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 38
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
2.3.5.2
mode.
mode, and generated from the clock that is a quarter of the low-frequency clock (fs) in the SLOW1/2 or
SLEEP0/1 mode. Therefore, the machine cycle time is 1/fcgck [s] in the NORMAL2 or IDLE2 mode and
is 4/fs [s] in the SLOW1/2 or SLEEP0/1 mode.
cannot be used as I/O ports in the dual-clock mode.)
it in the dual-clock mode, allow the low-frequency clock to oscillate at the beginning of the program.
Dual-clock mode
(1)
(2)
(3)
(4)
The gear clock (fcgck) and the low-frequency clock (fs) are used for the operation in the dual-clock
The main system clock (fm) is generated from the gear clock (fcgck) in the NORMAL2 or IDLE2
P03 (XTIN) and P04 (XTOUT) are used as the low-frequency clock oscillation circuit pins. (These pins
The operation of the TLCS-870/C1 Series becomes the single-clock mode after reset release. To operate
ate using the gear clock (fcgck) or the clock that is a quarter of the low-frequency clock (fs).
the low-frequency clock (fs).
released. For operations of the peripheral circuits in the SLOW mode, refer to the section of each
peripheral circuit.
SLOW2 to NORMAL2.
peripheral circuits operate using the clock that is a quarter of the low-frequency clock (fs).
SLOW2 mode.
released. For operations of the peripheral circuits in the SLOW mode, refer to the section of each
peripheral circuit.
gear clock (fcgck) or the clock that is a quarter of the low-frequency clock (fs).
ation returns to the NORMAL2 mode after this mode is released.
NORMAL2 mode
In this mode, the CPU core operates using the gear clock (fcgck), and the peripheral circuits oper-
SLOW2 mode
In this mode, the CPU core and the peripheral circuits operate using the clock that is a quarter of
In the SLOW mode, some peripheral circuits become the same as the states when a reset is
Set SYSCR2<SYSCK> to switch the operation mode from NORMAL2 to SLOW2 or from
In the SLOW2 mode, outputs of the prescaler and stages 1 to 8 of the divider stop.
SLOW1 mode
In this mode, the high-frequency clock oscillation circuit stops operation and the CPU core and the
This mode requires less power to operate the high-frequency clock oscillation circuit than in the
In the SLOW mode, some peripheral circuits become the same as the states when a reset is
Set SYSCR2<XEN> to switch the operation between the SLOW1 and SLOW2 modes.
In the SLOW1 or SLEEP1 mode, outputs of the prescaler and stages 1 to 8 of the divider stop.
IDLE2 mode
In this mode, the CPU and the watchdog timer stop and the peripheral circuits operate using the
The IDLE2 mode can be activated and released in the same way as for the IDLE1 mode. The oper-
Page 24
TMP89FM42
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