M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 94

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Notes 1: Also refer to “[Precautions when operating in timer mode]” and “[Precautions when oper-
TIMER A
5.2 Block description
Table 5.2.2 Reading and writing from and to timer Ai register
Timer mode
Event counter mode
One-shot pulse mode
Pulse width modulation (PWM) mode
5–4
5.2.1 Counter and reload register (timer Ai register)
Each of timer Ai counter and reload register consists of 16 bits.
The counter down-counts each time the count source is input. In the event counter mode, it can also
function as an up-counter.
The reload register is used to store the initial value of the counter. When the counter underflows or
overflows, the reload register’s contents are reloaded into the counter.
Values are set to the counter and reload register by writing a value to the timer Ai register. Table 5.2.1
lists the memory assignment of the timer Ai register.
The value written into the timer Ai register when counting is not in progress is set to the counter and reload
register. The value written into the timer Ai register when counting is in progress is set to only the reload
register. In this case, the reload register’s updated contents are transferred to the counter at the next
reload time. The value got when reading out the timer Ai register varies according to the operating mode.
Table 5.2.2 lists reading and writing from and to the timer Ai register.
2: When reading and writing to/from the timer Ai register, perform them in an unit of 16 bits.
ating in event counter mode].”
Operating mode
7702/7703 Group User’s Manual
Counter value is read out.
(Note 1)
Undefined value is read out.
Table 5.2.1 Memory assignment of timer Ai register
Note: When reset, the contents of the timer Ai
Read
Timer A0 register
Timer A1 register
Timer A2 register
Timer A3 register
Timer A4 register
Timer Ai register
register are undefined.
Address 47
Address 49
Address 4B
Address 4D
Address 4F
High-order byte
<During counting>
Written to only reload register.
<When not counting>
Written to both counter and
reload register.
16
16
16
16
16
Write
Address 4C
Address 4A
Address 4E
Address 46
Address 48
Low-order byte
16
16
16
16
16