Renesas RL78/G1H - Page 605

RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 587 of 920
Dec 22, 2016
(21) Timer read registers (BBTIMEREAD0, BBTIMEREAD1)
These registers are used to read the current count value of the 32-bit timer. Read from the lower bytes when
reading the timer count value. Then continue to read the upper bytes because the count value is latched
when reading the 0020
H address of LSB.
The BBTIMEREAD0 and BBTIMEREAD1 registers consist of 16 bits and can be accessed (serial interface
communication) in 8 bit unit.
Reset signal generation clears these registers to 0000H.
Figure 18 - 27 Timer Read Register 0 (BBTIMEREAD0) Format
Figure 18 - 28 Timer Read Register 1 (BBTIMEREAD1) Format
Address:
0021H, 0020H
After reset: 0000H R
Symbol 15 14 13 12 11 10 9 8
BBTIMER
EAD0
76543210
BBTIMEREAD0 Lower bits of the 32-bit timer (bits 15 to 0)
Address:
0023H, 0022H
After reset:
0000H
R
Symbol 15 14 13 12 11 10 9 8
BBTIMER
EAD1
76543210
BBTIMEREAD1 Upper bits of the 32-bit timer (bits 31 to 16)