tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 175
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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RA001
13.4.6.3 Register buffer configuration
(1)
(2)
TA0DRAL (TA0DRBL), the data is first stored into this temporary buffer, whether the double buffer
is enabled or disabled. Subsequently, when a write instruction is executed on TA0DRAH
(TA0DRBH), the set value is stored into the double buffer or TA0DRAH (TA0DRBH). At the same
time, the set value in the temporary buffer is stored into the double buffer or TA0DRAL
(TA0DRBL). (This structure is designed to enable the set values of the lower-level register and the
higher-level register simultaneously.) Therefore, when setting data to TA0DRA (TA0DRB), be sure
to write the data into TA0DRAL and TA0DRAH (TA0DRBL and TA0DRBH) in this order.
TA0CR<TA0DBF> to "0" disables the double buffer. Setting TA0CR<TA0DBF> to "1" enables the
double buffer.
Temporary buffer
The TMP89FM42 contains an 8-bit temporary buffer. When a write instruction is executed on
See Figure 13-1 for the temporary buffer configuration.
Double buffer
In the TMP89FM42, the double buffer can be used by setting TA0CR<TA0DBF>. Setting
See Figure 13-1 for the double buffer configuration.
- When the double buffer is enabled
- When the double buffer is disabled
tion, the set value is first stored into the double buffer, and TA0DRAH/L are not updated
immediately. TA0DRAH/L (TA0DRBH/L) compare the last set values to the counter value.
If a match is detected, an INTTCA0 interrupt request is generated and the double buffer set
value is stored into TA0DRAH/L (TA0DRBH/L). Subsequently, the match detection is exe-
cuted using a new set value.
value (the last set value) is read, not the TA0DRAH/L (TA0DRBH/L) values (the current
effective values).
stopped, the set value is immediately stored into both the double buffer and TA0DRAH/L
(TA0DRBH/L).
tion, the set value is immediately stored in TA0DRAH/L (TA0DRBH/L). Subsequently, the
match detection is executed using a new set value.
up counter overflows and the match detection is executed using a new set value. As a result,
the output pulse width may be longer than the set time. If that is a problem, enable the double
buffer.
stopped, the set value is immediately stored into TA0DRAH/L (TA0DRBH/L).
When a write instruction is executed on TA0DRAH (TA0DRBH) during the timer opera-
When a read instruction is executed on TA0DRAH/L (TA0DRBH/L), the double buffer
When a write instruction is executed on TA0DRAH/L (TA0DRBH/L) while the timer is
When a write instruction is executed on TA0DRAH (TA0DRBH) during the timer opera-
If the values set to TA0DRAH/L (TA0DRBH/L) are smaller than the up counter value, the
When a write instruction is executed on TA0DRAH/L (TA0DRBH/L) while the timer is
Page 161
TMP89FM42
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