H8SLASH3028F datasheet(474/923 Pages) RENESAS

474 / 923 page

Rev. 2.00, 09/03, page 444 of 890

Writing to RSTCSR: RSTCSR must be written by a word transfer instruction. It cannot be

written by byte transfer instructions. Figure 12.3 shows the format of data written to RSTCSR. To

write 0 in the WRST bit, the write data must have H'A5 in the upper byte and H'00 in the lower

byte. The data (H'00) in the lower byte is written to RSTCSR, clearing the WRST bit to 0. To

write to the RSTOE bit, the upper byte must contain H'5A and the lower byte must contain the

write data. Writing this word transfers a write data value into the RSTOE bit.

8 7

H'A5

H'00

Address

H'FFF8E*

8 7

H'5A

Write data

Address

H'FFF8E*

Writing 0 in WRST bit

Writing to RSTOE bit

Note: * Lower 20 bits of the address in advanced mode.

Figure 12.3 Format of Data Written to RSTCSR

Reading TCNT, TCSR, and RSTCSR: These registers are read like other registers. Reading

TCNT, TCSR, and RSTCSR: These registers are read like other registers. Byte transfer

instructions can be used. The read addresses are H'FFF8C for TCSR, H'FFF8D for TCNT, and

H'FFF8F for RSTCSR, as listed in table 12.3.

Table 12.3 Read Addresses of TCNT, TCSR, and RSTCSR

Address*

H'FFF8C

TCSR

H'FFF8D

TCNT

H'FFF8F

RSTCSR

Note: * Lower 20 bits of the address in advanced mode.

H8/3028F Datasheet(PDF) 474 Page - Renesas Technology Corp