HD6475328-CP10 Datasheet, PDF (244/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

12.1.4 Register Configuration
The PWM timer module has three registers for each channel as listed in table12-2.
Table 12-2 PWM Timer Registers
Initial
Channel Name
Abbreviation R/W
Value Address
1
Timer control register TCR
R/W
H'38
H'FFC0
Duty register
DTR
R/W
H'FF H'FFC1
Timer counter
TCNT
R/(W)* H'00
H'FFC2
2
Timer control register TCR
R/W
H'38
H'FFC4
Duty register
DTR
R/W
H'FF H'FFC5
Timer counter
TCNT
R/(W)* H'00
H'FFC6
3
Timer control register TCR
R/W
H'38
H'FFC8
Duty register
DTR
R/W
H'FF H'FFC9
Timer counter
TCNT
R/(W)* H'00
H'FFCA
* The timer counters are read/write registers, but the write function is for test purposes only.
Application programs should never write to these registers.
12.2 Register Descriptions
12.2.1 Timer Counter (TCNT)—H'FFC2, H'FFC4, H'FFCA
Bit
7
6
5
4
3
2
1
0
Initial value
Read/Write
0
0
0
0
0
0
0
0
R/W R/W R/W R/W R/W R/W R/W R/W
The PWM timer counters (TCNT) are 8-bit up-counters. When the output enable bit (OE) in the
timer control register (TCR) is set to 1, the timer counter starts counting pulses of an internal
clock source selected by clock select bits 2 to 0 (CKS2 to CKS0). After counting from H'00 to
H'F9, the timer counter repeats from H'00.
The PWM timer counters can be read and written, but the write function is for test purposes only.
Application software should never write to a PW timer counter, because this may have
unpredictable effects.
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