HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 332
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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TCNT0 and TCNT1 are up-counters. TCNT2 is an up/down-counter in phase counting mode and
an up-counter in other modes. TCNT3 and TCNT4 are up/down-counters in complementary PWM
mode and up-counters in other modes.
TCNT can be cleared to H'0000 by compare match with GRA or GRB or by input capture to GRA
or GRB (counter clearing function) in the same channel.
When TCNT overflows (changes from H'FFFF to H'0000), the OVF flag is set to 1 in TSR of the
corresponding channel.
When TCNT underflows (changes from H'0000 to H'FFFF), the OVF flag is set to 1 in TSR of the
corresponding channel.
The TCNTs are linked to the CPU by an internal 16-bit bus and can be written or read by either
word access or byte access.
Each TCNT is initialized to H'0000 by a reset and in standby mode.
10.2.8 General Registers (GRA, GRB)
The general registers are 16-bit registers. The ITU has 10 general registers, two in each channel.
Channel
0
1
2
3
4
A general register is a 16-bit readable/writable register that can function as either an output
compare register or an input capture register. The function is selected by settings in TIOR.
When a general register is used as an output compare register, its value is constantly compared
with the TCNT value. When the two values match (compare match), the IMFA or IMFB flag is set
to 1 in TSR. Compare match output can be selected in TIOR.
Bit
Initial value
Read/Write
Abbreviation
GRA0, GRB0
GRA1, GRB1
GRA2, GRB2
GRA3, GRB3
GRA4, GRB4
R/W
15
1
R/W
14
1
R/W
13
1
Function
Output compare/input capture register
Output compare/input capture register; can be buffered by buffer
registers BRA and BRB
R/W
12
1
R/W
11
1
R/W
10
1
R/W
320
9
1
R/W
8
1
R/W
7
1
R/W
6
1
R/W
5
1
R/W
4
1
R/W
3
1
R/W
2
1
R/W
1
1
R/W
0
1
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