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PAC1941T-1E/4MX. データシート(PDF) 39 Page - Microchip Technology |
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PAC1941T-1E/4MX. データシート(HTML) 39 Page - Microchip Technology |
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39 / 96 page  2021 Microchip Technology Inc. DS20006543A-page 39 PAC194X 6.6.9 BLOCK READ – SMBUS VERSION The PAC194X can also support the SMBus version of Block Read. If the Byte Count bit is set, Block Read will result in the device sending the Byte Count data before the first data byte. This protocol is shown in Table 6-11. TABLE 6-10: BLOCK READ PROTOCOL – I2C VERSION (DEFAULT) START Client Address WR ACK Register Address ACK STAR T Client Address RD ACK Register Data 1 → 0 YYYY_YYY 0 0 XXh 0 1 → 0 YYYY_YYY 1 0 XXh ACK Register Data ACK Register Data ACK Register Data ACK Register Data NACK STOP 0 XXh 0 XXh 0 XXh 0 XXh 1 0 → 1 TABLE 6-11: BLOCK READ PROTOCOL – SMBUS VERSION (MUST SET BYTE COUNT BIT) START Client Address WR ACK Register Address ACK STAR T Client Address RD ACK Byte Count 1 → 0 YYYY_YYY 0 0 XXh 0 1 → 0 YYYY_YYY 1 0 XXh = N ACK Register Data ACK Register Data ACK Register Data ACK Register Data NACK STOP 0 XXh 0 XXh 0 XXh 0 XXh 1 0 → 1 |
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